Isa Okajima

Tokyo, Japan

Last Updated: 09/26/2026

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Found 69 publications

Chronotype and insomnia symptoms in the incidence and persistence of depressive symptoms: An 8-year longitudinal cohort study.

Chronotype and insomnia symptoms in the incidence and persistence of depressive symptoms: An 8-year longitudinal cohort study.

Journal: Sleep medicine
Published: July 03, 2026

Characterizing poor sleep hygiene in chronic insomnia: Implications of addressable and non-addressable factors for sleep hygiene education.

Characterizing poor sleep hygiene in chronic insomnia: Implications of addressable and non-addressable factors for sleep hygiene education.

Journal: Sleep medicine
Published: April 05, 2026

Differences in insomnia-related factors between working-age and older adults: A comparison of nocturnal and daytime symptoms.

Differences in insomnia-related factors between working-age and older adults: A comparison of nocturnal and daytime symptoms.

Journal: Sleep medicine: X
Published: March 07, 2026

Sleep debt and depressive symptoms among workers: the mediating role of fatigue.

Sleep debt and depressive symptoms among workers: the mediating role of fatigue.

Journal: Frontiers in public health
Published: January 22, 2026

Impact of sleep and psychological flexibility on young adults' physical and mental well-being.

Impact of sleep and psychological flexibility on young adults' physical and mental well-being.

Journal: Scientific reports
Published: September 02, 2025

Remission, treatment response, and treatment adherence across the delivery methods of cognitive behavioral therapy for insomnia: A systematic review and meta-analysis of randomized controlled trials.

Remission, treatment response, and treatment adherence across the delivery methods of cognitive behavioral therapy for insomnia: A systematic review and meta-analysis of randomized controlled trials.

Journal: Sleep medicine reviews
Published: March 06, 2025

Exploring the relationship between work performance and nonrestorative sleep among daytime workers with and without insomnia symptoms.

Exploring the relationship between work performance and nonrestorative sleep among daytime workers with and without insomnia symptoms.

Journal: Sleep medicine
Published: February 26, 2025

Does digital cognitive behavioral therapy improve the insomnia and depression of workers to healthy levels? An open trial.

Does digital cognitive behavioral therapy improve the insomnia and depression of workers to healthy levels? An open trial.

Journal: BioPsychoSocial medicine
Published: February 25, 2025

A 2-year follow-up study on the course of at-risk delayed sleep-wake phase disorder in the young generation and its impact on daytime function.

A 2-year follow-up study on the course of at-risk delayed sleep-wake phase disorder in the young generation and its impact on daytime function.

Journal: Sleep medicine
Published: January 05, 2025

Development, reliability, and validity of the quality of life scale for insomnia: a health-related quality of life instrument for insomnia.

Development, reliability, and validity of the quality of life scale for insomnia: a health-related quality of life instrument for insomnia.

Journal: Frontiers in psychiatry
Published: December 02, 2024

How is loneliness orientation implicated in the relationship between sleep problems, loneliness intensity, and school refusal in adolescents?

How is loneliness orientation implicated in the relationship between sleep problems, loneliness intensity, and school refusal in adolescents?

Journal: Sleep and biological rhythms
Published: November 22, 2024

Psychological flexibility as a moderator of the association between premenstrual dysphoric disorder, depression, anxiety, positive parenting, and negative parenting: a cross-sectional study.

Psychological flexibility as a moderator of the association between premenstrual dysphoric disorder, depression, anxiety, positive parenting, and negative parenting: a cross-sectional study.

Journal: BioPsychoSocial medicine
Published: November 05, 2024
Showing 1-12 of 69

Last Updated: 09/26/2026