Takano, Y., Okajima, I., Ando, T., Iwano, S., & Inoue, Y. (in press). Presenteeism and sleep duration on workdays and days
off. Occupational Medicine.
Aoki, Y., Takesu, Y., Matsumoto, Y., Sakurai, H., Tsuboi, T., Okajima, I.,
Tachimori, H., Komada, Y., Watanabe, K., & Zimmerman, M. (in press). A psychometric analysis of the Japanese version of the Clinically Useful Depression Outcome Scale supplemented with
questions for the DSM-5 anxious distress specifier (CUDOS-A). Neuropsychopharmacology Reports.
Published
学術論文
Matsumoto, Y., Sakurai, H., Aoki, Y., Takesu, Y., Okajima, I., Tachimori, H., Murao, M., Maruki, T., Tsuboi, T., & Watanabe,
K. (2024). Assessing the Quick Inventory of Depressive Symptomatology self-report scores to predict continuous employment in mood disorder patients. Frontiers in Psychiatry,
15, 1321611.
Osao, M., Okajima, I., & Inoue, Y. (2024). Cross-sectional
analyses of factors associated with the presence and aggravation of chronic insomnia by symptom subtypes. Psychiatry and Clinical Neurosciences Reports, 3(1),
e184.
Takano, Y., Ubara, A., Machida, N., Ibata, R.,
& Okajima, I. (2024). Psychometric properties
of the Japanese version of the Insomnia Catastrophizing Scale and relationship of insomnia severity with catastrophic thoughts, safety behaviors and dysfunctional
beliefs. Sleep Medicine, 114,
64-72.
Takano, Y., Ibata, R., Machida, N., Ubara, A.,
& Okajima, I. (2023). Effect of cognitive behavioral therapy for insomnia in workers: A systematic review and meta-analysis of randomized controlled
trials. Sleep Medicine Reviews, 71,
101839.
Ibata, R., Takano, Y., Machida, N., Ubara, A., Motoya, R., & Okajima, I. (2023). Development and validation of the Japanese version of the
Restorative Sleep Questionnaire in community samples. Sleep Medicine, 108, 45-52.
Futenma, K., Takesu, Y., Komada, Y., Shimura, A., Okajima, I., Matsui, K., Tanioka, K., & Inoue, Y. (2023). Delay sleep-wake
phase disorder and its related sleep behaviors in the young generaration. Frontiers in Psychiatry, 14, 1174719
Takesu, Y., Sakurai, H., Aoki, Y., Takeshima, M., Ie, K., Matsui, K., Utsumi, T., Shimura, A., Okajima, I., Kotorii, N.,
Yamashita, H., Suzuki, M., Kuriyama, K, Shimizu, E., Mishima, K., Watanabe, K., & Inada, K. (2023). Treatment strategy for insomnia disorder: Japanese Expert Consensus. Frontiers in
Psychiatry, 14, 1168100.
Okajima, J., & Okajima, I. (2023). Psychometric properties of the Japanese version of the parental acceptance and action
questionnaire in parents with infants and toddlers. International Journal of Environmental Research
and Public Health, 20, 5674.
Yang, C-M., Lu, Y-Y., Lee, H-C., Li, S-X., Suh, S., Okajima, I., & Huang, Y-C. (2023). Can Adding personalized
rule-based feedback improve the therapeutic effect of self-help digital cognitive behavioral therapy for insomnia in young adults?Sleep Medicine, 107, 36-45.
Takano, Y., Iwano, S., Ando, T., &Okajima, I. (2023). Sleep debt
madiates the relationship between work-related social factors, presenteeism, and well-being in Japanese workers.International Journal of Environmental Research and Public Health, 20, 5310.
Okajima, I., Kadotani, H., & the NinJa Sleep study group. (2023). Association of sleep reactivity and anxiety sensitivity with
insomnia-related depression and anxiety among city government employees in Japan. Clock & Sleep, 5, 167-176.
Suh, S., Nam, H., Chang, J., Trockel, M. T., Okajima, I., Yang, C-M., Chan, N-Y., & Li, S. X. (2023). Predictors
of dropout in university students participating in an 8-week e-mail based cognitive-behavioral therapy for insomnia intervention. Sleep
and Breathing, 27, 345-353.
Okajima I. (2022). Is COVID-somnia fact or fiction? Sleep Medicine Research,
13(3), 121-125.
Kadotani, H., Okajima, I., Yang, K., & Lim, M. H. (2022). Editorial: Impact of social
isolation and loneliness on mental health and wellbeing. Frontiers in Publich Mental Health. doi:
10.3389/fpubh.2022.1106216.
Ayabe, N., Nakajima, S., Okajima, I., Inada, K., Yamadera, W., Yamashita, H., Tachimori, H.,
Kamei, Y., Takeshima, M., Inoue, Y., & Mishima, K. (2022). Development and validation of the Japanese version of Hyperarousal Scale. BMC Psychiatry, 22, 617.
Okajima, I., Honda, Y., Semba, O., Kiyota, Y., & Tani, Y. (2022). Effects of COVID-19-related anxiety and sleep
problems on loneliness and feelings of school refusal in adolescents. Frontiers in Psychiatry, 13, 918417.
Tomishima, S., Komada, Y., Tanioka, K., Okajima, I., & Inoue, Y. (2022). Prevalence and factors associated with the risk of delayed sleep-wake phase disorder in Japanese
Youth. Frontiers in Psychiatry, 13, 878042.
Chan, N. Y., Lam, S. P., Zhang, J., Chan, J. W. Y., Mandy, Y. M. W., Suh, S., Yang,
C-M, Okajima, I., Li, A. M., Wing, Y. K., and Li, S. X. (2022). Efficacy of email-delivered vs. face-to-face group cognitive
behavioral therapy for insomnia in youths: A randomized controlled trial. Journal of Adolescent Health, 70(5), 763-773.
Ishii, M., Ito, W., Karube, Y., Ogawa, Y., Tagawa, A., Maeda, S., Sato, H.,
Takahashi, T., Inomata, N., Narisawa, H., Takaesu, Y., Watanabe, K., & Okajima, I. (2022). Effects of transdiagnostic
group treatment for sleep disturbances in adult attention-deficit/hyperactivity disorders and autistic spectrum disorder: A pilot study. Sleep Biological and Rhythms, 20, 173-180.
Ubara, A., Tanizawa, N., Harata, M., Suh, S., Yang, C-M., Li, S. X.,
& Okajima, I. (2022). How does e-mail-delivered cognitive behavioral therapy work for young adults (18—28 years) with
insomnia? Mediators of changes in insomnia, depression, anxiety, and stress. International Journal of Environmental Research and Public Health,
19, 4423.
Aoki, Y., Takaesu, Y., Suzuki, M., Okajima, I., Takeshima, M., Shimura, A., Utsumi, T., Kotorii, N., Yamashita, H., Kuriyama, K., Watanabe, N., & Mishima, K. (2022). Development and
acceptability of a decision aid for chronic insomnia considering discontinuation of benzodiazepine hypnotics. Neuropsychopharmacology
Reports, 42, 10-20.
Ito, Y., Takeshima, M., Kaneita, Y., Uchimura N., Inoue, Y., Honda, M., Yamadera,
W., Watanabe, N., Kitamura, S., Okajima, I., Ayabe, N., Minamizono, S., Nomura, K., & Mishima, K. (2022). Associations between
the 2011 great east Japan earthquake and tsunami and the sleep and mental health of Japanese people: A 3-wave repeated survey. Nature and
Science of Sleep, 14, 61-73.
Okajima, I., Tanizawa, N., Harata, M., Suh, S., Yang, C-M., Li, S. X., & Trockel, M. T. (2022). Can an e-mail-delivered CBT for
insomnia validated in the West be effective in the East? A randomized controlled trial. International Journal of Environmental Research and
Public Health, 19(1), 186.
Matsui, K., Komada, Y., Okajima,
I., Takaesu, Y., Kuriyama, K., & Inoue, Y. (2021). A cross-sectional study of evening hyperphagia and nocturnal ingestion: Core constituents of night eating syndrome with
different background factors. Nutrients, 13 (11), 4179.
Okajima, I., Chung, S., & Suh, S. (2021). Validation of the Japanese-version of Stress and Anxiety to Viral Epidemics-9 (SAVE-9)
and relationship among stress, insomnia, anxiety, and depression in healthcare workers exposed to coronavirus disease 2019. Sleep
Medicine, 84, 397-402.
Narisawa H., Inoue, Y., Kobayashi, M.,
Okajima, I., Kikuchi, T., Kagimura, T., Matsui, K., Inada, K., & Mishima, K. (2021). Development and validation of the Benzodiazepine Hypnotics Withdrawal Symptom Scale
(BHWSS) based on item response theory. Psychiatry Research, 300, 113900.
Kanda, Y., Takaesu, Y., Kobayashi, M., Komada, Y., Futenma, K.,
Okajima, I., Watanabe, K., & Inoue, Y. (2021). Reliability and validity of the Japanese version of the Biological
Rhythms Interview of Assessment in Neuropsychiatry-self report for delayed sleep-wake phase disorder. Sleep Medicine, 81,
288-293.
Okajima, I., Komada, Y., Ito, Y., & Inoue, Y. (2021). Sleep debt and social jetlag
associated with sleepiness, mood, and work performance among workers in Japan. International Journal of Environmental Research and
Public Health, 18(6), 2908.
Ito, K., Kadotani, H., Okajima, I., Ubara, A., Ichikawa, M., Omichi, C., Miyamoto, T., Matsuda, A., Sumi,
Y., & Kitagawa, H. (2021). Large questionnaire survey on sleep duration and insomnia using the TV hybridcast system by Japan Broadcasting Corporation (NHK).International Journal of Environmental Research and Public Health, 18(5), 2691.
Hara, S., Nonaka, S., Ishii, M., Ogawa, Y., Yang, C-M., & Okajima, I. (2021). Validation of Japanese version of the Sleep Hygiene Practice Scale. Sleep
Medicine, 80, 204-209.
Komada, Y.,Okajima, I., &
Kuwata, T. (2020). The effects of milk and diary products on sleep: A systematic review. International Journal of Environmental Research and Public Health, 17(24), 9440.
Okajima, I., Miyamoto, T., Ubara, A., Omichi, C., Matsuda, A., Sumi, Y., Matsuo, M., Ito, K., & Kadotani, H. (2020). Evaluation of
severity levels of the Athens Insomnia Scale based on the criterion of Insomnia Severity Index. International Journal of
Environmental Research and Public Health, 17(23), 8789.
Matsui, K., Kuriyama, K., Yoshiike, T., Nagao, K., Ayabe, N., Komada, Y., Okajima,
I., Ito, Y., Ishigooka, J., Nichimura, K., & Inoue, Y. (2020). Theeffect of short orlong sleep duration on quality of life and depression: An internet-based survey in Japan. Sleep Medicine, 76, 80-85.
Okajima, I., Ishii, M., Ochi, M., & Nicassio, P. M. (2020). Development and validity of the Japanese version of the pre-sleep
arousal scale. Tohoku Journal of Experimental Medicine, 252(2), 169-176.
成瀬麻夕・駒田陽子・岡島 義・井上雄一・坂野雄二・井上 猛(2020).Biological Rhythms Interview of Assessment in Neuropsychiatry(BRIAN)日本語版の信頼性と妥当性の検討 精神医学,62(2), 1277-1286.
Takeshima, M., Utsumi, T., Aoki, Y., Wang, Z., Suzuki, M., Okajima, I., Watanabe, N., Watanabe, K., & Takaesu, Y. (2020). Response to 'Efficacy and safety of bright light therapy for bipolar
disorder.' Psychiatry and Clinical Neurosciences, 74(7), 410-411.
Okajima, I., Akitomi, J., Kajimaya, I., Ishii, M., Murakami, H., & Yamaguchi, M. (2020). Effects of a tailored brief behavioral
therapy application on insomnia severity and social disabilities among workers with insomnia in Japan: A randomized clinical trial. JAMA Network Open, 3 (4), e202775.
Takeshima, M., Utsumi, T., Aoki, Y., Wang, Z., Suzuki, M., Okajima, I., Watanabe, N., Watanabe, K., & Takaesu, Y. (2020). Efficacy and safety of bright light therapy for manic and depressive symptoms in
patients with bipolar disorder: A Systematic Review and Meta-analysis. Psychiatry and Clinical Neurosciences, 74, 247-256.
Takaesu, Y., Utsumi, T., Okajima, I., Shimura, A., Kotorii, N., Kuriyama, K., Yamashita,
H., Suzuki, M., Watanabe, N., & Mishima, K. (2019). Psychosocial Intervention for Discontinuing Benzodiazepine Hypnotics in Patients with Chronic Insomnia: A Systematic
Review and Meta-analysis. Sleep Medicine Reviews, 48, 101214.
Komada, Y., Okajima, I., Kitamura,
S., & Inoue, Y. (2019). A survey on social jetlag in Japan: A nationwide, cross-sectional internet survey. Sleep and Biological Rhythms, 17(4), 417-422.
Ayabe, N., Okajima, I., Nakajima, S., Inoue, Y., Watanabe, N., Yamadera, W., Uchiyama, N., Tachimori, H., Kamei, Y., & Mishima, K. (2018).
Effectiveness of cognitive behavioral therapy for pharmacotherapy-resistant chronic insomnia: A multi-center randomized controlled trial in Japan. Sleep Medicine,
50, 105-112.
Kobayashi, M., Okajima, I., Narisawa, H., Kikuchi, T., Matsui, K., Inada, K., Ishigoka, J., & Inoue,
Y. (2018). Development of a new benzodiazepine hypnotics withdrawal symptom scale. Sleep and Biological Rhythms,16(3),
263-271.
Okajima, I., & Inoue, Y. (2018). Efficacy of cognitive behavioral therapy for comorbid insomnia: A meta-analysis. Sleep and Biological Rhythms, 16(1),
21-35.
Okajima, I., & Chen, J. (2017). The effect of insomnia on changes in anxiety,
depression, and social function after a transdiagnostic treatment targeting excessive worry. Sleep and Biological Rhythms, 15(3), 243-249.
Nakajima, S., Komada, Y., Sasai, T., Okajima, I., Harada, Y., Watanabe, K., Inoue,
Y. (2017). Higher sleep reactivity and insomnia mutually aggravate depressive symptoms: A cross-sectional epidemiological study in Japan. Sleep Medicine, 33,
130-133.
Okajima, I., Nakajima,
S., Ochi, M., & Inoue, Y. (2017). Association among changes in sleep-related beliefs, sleep reactivity, and improvement of insomnia following cognitive behavioral therapy.
Sleep Medicine, 29, 96-97.
Ito, W., Komada, Y., Okajima, I.,
& Inoue, Y. (2017). Excessive daytime sleepiness in adults with possible attention deficit/hyperactivity disorder (ADHD): A web-based cross-sectional study. Sleep Medicine, 32,
4-9.
Ito, E., Tsuiki, S., Maeda, K., Okajima, I., & Inoue, Y. (2016). Oropharyngeal
crowding closely relates to aggravation of obstructive sleep apnea. Chest, 150(2), 346-352.
Ishikawa, S., Motoya, R., Sasagawa, S., Takahashi,
T., Okajima, I., Takeishi, Y., & Essau, C.A. (2015). Mental Health problems among undergraduates in Fukushima, Tokyo, and Kyoto after the March 11 Tohoku
Earthquake. Tohoku Journal of Experimental Medicine, 236(2), 115-122.
Okajima, I., Nakajima,
S., Ochi, M., & Inoue, Y. (2014). Reducing dysfunctional beliefs about sleep does not significantly improve insomnia in cognitive behavioral therapy. PLOS ONE, 9(7), e102565.
Nakajima, S., Inoue, Y., Sasai, T., Okajima, I.,
Komada, Y., Nomura, T., & Takahashi, K. (2014). Impact of frequency of nightmares comorbid with insomnia on depression in Japanese rural community residents: A cross-sectional
study. Sleep Medicine, 15(3), 371-374.
Nakajima, S., Okajima, I., Sasai, T., Kobayashi,
M., Furudate, N., Drake, C.L., Roth, T. R., & Inoue, Y. (2014). Validation of the Japanese version of the Ford Insomnia Response to Stress Test (FIRST-J) and the association of
sleep reactivity with trait anxiety and insomnia. Sleep Medicine, 15(2), 196-202.
Essau, C.A., Ishikawa, S., Sasagawa, S.,
Otsui, K., Sato, H., Okajima, I., Georgiou, G. A., O'Callaghan, J.,
& Bray D. (2013). Psychopathological symptoms in two generations of the same family: A cross-cultural comparison. Social
Psychiatry and Psychiatric Epidemiology, 48(12), 2017-2026.
Okajima, I., Nakamura, M., Nishida, S., Usui, A., Kanno,
M., Nakajima, S., & Inoue, Y. (2013). Cognitive behavioural therapy with behavioural analysis for pharmacological treatment-resistant chronic insomnia. Psychiatry
Research, 210(2), 515-521.
高垣耕企・岡島 義・国里愛彦・中島 俊・金井嘉宏・石川信一・坂野雄二(2013).Behavioral Activation for Depression
Scale(BADS)日本語版の作成 精神科診断学,6(1),76-85.
Okajima, I., Nakajima, S., Kobayashi, M., & Inoue,
Y. (2013). Development and validation of the Japanese version of the Athens Insomnia Scale (AIS-J). Psychiatry and Clinical Neurosciences, 67(6), 420-425.
Takagaki, K., Okajima, I., Kunisato, Y., Nakajima, S., Kanai, Y., Ishikawa, S., &
Sakano, Y. (2013). Preliminary assessment of the behavioral activation model in Japanese undergraduate students. Psychological
Reports, 112(1), 47-59.
Essau, C. A.,
Sasagawa, S., Ishikawa, S., Okajima, I., O'Callaghan, J., & Bray, D. (2012). A Japanese form of social anxiety (taijin Kyofusho): Frequency and correlates in two generations of the same family in Japan. International Journal of Social Psychiatry, 58(6), 635-642.
Komada, Y., Nomura, T., Kusumi, M., Nakashima,
K., Okajima, I., Sasai, T., & Inoue, Y. (2012). A 2-year follow-up study on the symptoms of sleep disturbances/insomnia and their effects on daytime functioning. Sleep Medicine, 13(9), 1115-1121.(日本睡眠学会 第18回睡眠研究奨励賞〔臨床系論文〕)
Sakuta, K., Komada, Y., Kagimura, T., Okajima, I., Nakamura, M., & Inoue, Y.
(2012). Factors associated with severity of daytime sleepiness and indications for initiating treatment in patients with periodic limb movements during sleep. Sleep and Biological
Rhythms, 10(3), 187-194.
Okajima, I., Komada, Y., Nomura, T., Nakashima, K., & Inoue, Y. (2012). Insomnia as a risk for depression: A longitudinal epidemiological study on a
Japanese rural cohort. Journal of Clinical Psychiatry, 73(3), 377-383.
Essau, C. A., Ishikawa, S., Sasagawa, S.,
Sato, H., Okajima, I., Otsui, K., Georgiou, G. A., O'Callahan, J., & Michie, F. (2011). Anxiety symptoms among
adolescents in Japan and England: Their relationship with self-construals and social support. Depression and Anxiety, 28(6), 509-516.
Komada, Y., Abe, T., Okajima, I.,
Asaoka, S., Matsuura, N., Usui, A., Shirakawa, S., & Inoue, Y. (2011). Short sleep duration and irregular bedtime are associated with increased behavioral problems among Japanese
preschool-age children. Tohoku Journal of Experimental Medicine, 224 (2), 127-136.
Okajima, I., Komada, Y., & Inoue,
Y. (2011). A meta-analysis on the treatment effectiveness of cognitive behavioral therapy for primary insomnia. Sleep and Biological
Rhythms, 9 (1), 24-34.(日本睡眠学会 第17回睡眠研究奨励賞〔機関誌掲載論文〕)
Komada, Y., Nomura, T., Kusumi, M., Nakashima,
K., Okajima, I., Sasai, T., & Inoue, Y.
(2011). Correlations among insomnia symptoms, sleep medication use and depressive symptoms. Psychiatry and Clinical Neurosciences, 65(1),
20-29.
岡島 義・福原佑佳子・山田幸恵・坂野雄二・La Greca, A.
M.(2009).Social Anxiety Scale for
Children-Revised(SASC-R)とSocial Anxiety Scale for
Adolescents(SAS-A)日本語版の作成 児童青年精神医学とその近接領域,50,457-468.
Okajima,
I., Kanai, Y., Chen, J., & Sakano, Y.
(2009). Effects of safety behaviour on the maintenance of anxiety and negative belief
social anxiety disorder. International Journal of Social Psychiatry, 55(1), 71-81(BioMedLib により当該研究分野で Top 10 articleに選出[2011.03.04]).
岡島 義・福原佑佳子・秋田久美・坂野雄二(2008).Liebowitz Social Anxiety Scale for
Children and Adolescents(LSAS-CA)日本語版の作成 児童青年精神医学とその近接領域,49,531-540.
岡島 義・金井嘉宏・笹川智子・金澤潤一郎・秋田久美・陳 峻雯・坂野雄二(2008).社会不安障害尺度(Social Phobia and Anxiety Inventory日本語版)の開発 行動療法研究,34,297-309.
Ishikawa,
S., Okajima, I., Matsuoka, H., & Sakano, Y. (2007). Cognitive behavioural therapy for anxiety disorders in children and adolescents:A meta-analysis. Journal of Child and Adolescent Mental Health, 12, 164-172.