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This study will recruit 60 night shift workers with shift work disorder. They will be invited to wear actigraphy for 3 weeks. In the first week the participants will sleep at the time they used to, and their chronotype will be determined by actigraphy and Munich Chronotype Questionnaire. In the second week the participants will be randomly assigned to morning sleep or evening sleep time, and will change to the other in the third week. We will compare sleepiness, sleep quality, daytime vigilance score changes using mixed method ANOVA. We will also examine the interaction effect of chronotype and sleep schedule on sleep-related outcome.
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| Label | Type | Description | Intervention Names |
|---|---|---|---|
| Morning-evening sleep schedule | Experimental |
| |
| Evening-morning sleep schedule | Active Comparator |
|
| Name | Type | Description | Arm Group Labels | Other Names |
|---|---|---|---|---|
| Morning sleep schedule | Behavioral | sleep right after night shifts |
|
| Measure | Description | Time Frame |
|---|---|---|
| Sleep quality | Pittsburgh sleep quality index (PSQI), range from 0 (better) to 21 (worse) | Change from baseline score at the second and third week. |
| Measure | Description | Time Frame |
|---|---|---|
| Daytime sleepiness | Karolinska Sleepiness Scale (KSS), range from 1 (better) to 9 (worse) | Change from baseline score at the start and end of each night shift. |
| Alertness | Psychomotor vigilance test (PVT), reaction time (longer the worse) and lapses (larger the worse) |
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Inclusion Criteria:
Exclusion Criteria:
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| Facility | Status | City | State | ZIP | Country | Contacts |
|---|---|---|---|---|---|---|
| China Medical University Hospital | Taichung | 404332 | Taiwan |
| PubMed Identifier | Type | Citation | Retractions |
|---|---|---|---|
| 35148396 | Derived | Cheng WJ, Hang LW, Kubo T, Vanttola P, Huang SC. Impact of sleep timing on attention, sleepiness, and sleep quality among real-life night shift workers with shift work disorder: a cross-over clinical trial. Sleep. 2022 Apr 11;45(4):zsac034. doi: 10.1093/sleep/zsac034. |
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| Evening sleep schedule | Behavioral | sleep before night shifts |
|
| Change from baseline score at the start and end of each night shift. |