Related Experiment Video
Updated: Aug 11, 2026

Multi-Modal Home Sleep Monitoring in Older Adults
Published on: January 26, 2019
Effect of short duration morning bright light in elderly men: sleep structure
M Kohsaka1, N Fukuda, R Kobayashi
1Sapporo Hanazono Hospital, Sapporo, Japan. shinobu-masako@po.teleway.ne.jp
Abstract:
Sleep structure was measured in five healthy elderly men in their homes. The subjects were exposed to bright light (6000 lx) for 30 min in the morning or instructed to sit in front of a desktop lighting device without light. Relative to the control conditions, bright light exposure significantly decreased time in bed and the number of awakenings. Rapid eye movement sleep was significantly fragmented by stage 1 sleep in the control condition compared with the bright light condition. These findings indicate that a short duration of morning bright light changes sleep structure and is effective in maintaining sleep.
Related Concept Videos
Photoreceptors and Visual Pathways
Management of Insomnia
Chronopharmacokinetics: Circadian Rhythms and Influence on Drug Response
The time of drug administration is an important factor to consider, as it can influence the toxic dose of a drug. For example, a study conducted by Prins et al. in 1997 examined the effects of the timing of...
Insufficient Sleep and Sleep Deprivation
Sleep deprivation is a more severe form of sleep loss...
Stages of Sleep
Before sleep begins, in wakefulness, the brain exhibits primarily beta waves, which are high in frequency and low in amplitude, indicating alertness...

