Poor sleep is closely related to circadian misalignment; shift workers often experience shift work disorder characterized by excessive sleepiness and recurrent shift work schedules-associated insomnia. This study aims to examine the effects of a program of chronobiology-guided lifestyle interventions (CGLI) on insomnia severity, cognitive performance (psychomotor vigilance and processing speed), and sleepiness in female nurses undertaking rotating-shift work.
This study will use a parallel-group, randomized, assessor-blind, wait-list controlled design to determine the effects of a program of multimodal lifestyle interventions based on chronobiology, consisting of timed bright light exposure, meal timing manipulations, and sleep hygiene education on insomnia severity, cognitive performance (psychomotor vigilance and processing speed), and sleepiness in female nurses undertaking rotating-shift work.
Study Type
INTERVENTIONAL
Allocation
RANDOMIZED
Purpose
OTHER
Masking
DOUBLE
Enrollment
80
1\) timed bright light exposure using blue-enriched white light glasses, 2) recommendations for meal timing, and 3) sleep hygiene education
Taipei Veterans General Hospital
Taipei, Taiwan
RECRUITINGinsomnia severity
The Insomnia Severity Index will be used to determine the severity of insomnia. The Insomnia Severity Index with a total score ranging from 0 to 28. A higher Insomnia Severity Index score indicates more severe insomnia.
Time frame: Through study completion, an average of 14days
The neurobehavioral function of cognitive performance
The neurobehavioral function will be evaluated using the Walter Reed Psychomotor Vigilance Test (PVT), a portable reaction-time test based on the Dinges and Powell digital test. The PVT will be testing a 5-min test with responses to randomly spaced stimuli per test.
Time frame: Through study completion, an average of 14 days
The processing speed of cognitive performance
A Tablet-based Symbol Digit Modalities Test (T-SDMT) will be used to test processing speed.
Time frame: Through study completion, an average of 14 days
The sleepiness at work
The Karolinska Sleepiness Scale (KSS) will be used to measure sleepiness at work. It is on a scale of 1 to 9. A higher score is more sleepy.
Time frame: Through study completion, an average of 14 days
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