Don's Home Health Sleep Contact


See also Sleep Aids

Sleep Problems in the Elderly
Web sites include the American Sleep Disorders Association (,
 the National Sleep Foundation (
 and Sleep Home Pages (

A short afternoon nap (<30 min.) improves alertness in the afternoon.
Afternoon alertness was better than morning alertness after a nap and
worse if they took no nap.
Some say you can nap for up to 1 hour.
Source: Horoshima Univ Study. Tamaki, Shirota, Hayashi, Hori Students who took a 15 min. nap after lunch had fewer errors on a logical reasoning test and were more alert compared to when they did not nap. However, memory test scores were only slightly better. Source: Takahashi, M. and Arito, H., Maintenance of alertness and performance by a brief nap after lunch under prior sleep deficit, Sleep, 23:813-819, 2000. Summary at
Sleep Trackers
Types of sleep
UP3: The world's most advanced tracker - The Jawbone Blog Links:
Sleep Monitoring with Activity Trackers
Natural Patterns of Sleep | Healthy Sleep
What are the different stages of the sleep cycle? - Quora
Sleep Aids
Half Your Brain Stands Guard When Sleeping In A New Place : NPR

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last updated 8 Sep 2002