The Effect of Evening Bright Light in Delaying the Circadian Rhythms and Lengthening the Sleep of Early Morning Awakening Insomniacs
Evening bright light may delay body clock and extend sleep in people who wake up too early
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Abstract
Bright light stimulation in the evening resulted in a mean increase of total sleep time of more than 1 hour in early morning awakening insomniacs.
- Nine early morning awakening insomniacs were evaluated for their sleep patterns using wrist actigraphy.
- Initial evaluations indicated that the temperature rhythms of these insomniacs were earlier than normal.
- Exposure to bright light (2,500 lux) from 2000 to 2400 hours delayed temperature rhythm markers by 2-4 hours.
- Melatonin phase markers were also delayed by 1-2 hours following the bright light treatment.
- Sleep onset times did not change, but the mean final wake-up time was delayed from 0459 hours to 0611 hours.
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