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Time estimation during nocturnal sleep in human subjects
Sayaka Aritake1, Makoto Uchiyama, Hirokuni Tagaya
1Department of Life Sciences and Bio-informatics, Graduate School of Allied Health Sciences, Tokyo Medical and Dental University, Yushima, Bunkyo, Tokyo 113-0034, Japan.
Neuroscience Research
|July 9, 2004
Summary
Human brains estimate time during sleep, with accuracy changing throughout the night. This time estimation ability fluctuates, showing overestimation early in sleep and underestimation later.
Area of Science:
- Neuroscience
- Sleep Science
- Chronobiology
Background:
- The brain's interval timing clock is theorized for nocturnal time estimation.
- Mechanisms behind time over/underestimation during sleep remain unclear.
Purpose of the Study:
- To investigate human brain perception of time passage during sleep.
- To explore brain mechanisms influencing sleep time estimation accuracy.
Main Methods:
- 11 healthy volunteers participated in timed estimation trials during 9-hour nocturnal sleep.
- Trials were conducted six times under controlled conditions.
- Time Estimation Ratio (TER) calculated as subjective to actual time.
Main Results:
- TER significantly decreased across sleep trials, indicating changing time perception.
- Individual TER positively correlated with prior slow-wave sleep.
- Individual TER negatively correlated with prior REM sleep.
Conclusions:
- The human brain can estimate time during sleep without external cues.
- Time perception accuracy during sleep shifts from overestimation to underestimation.
- Sleep stages, specifically slow-wave and REM sleep, influence time estimation accuracy.