Human sleep-needs vary by age and amongst individuals; sleep is considered to be adequate when there is no daytime sleepiness or dysfunction. Moreover, self-reported sleep duration is only moderately correlated with actual sleep time as measured by actigraphy, and those affected with sleep state misperception may typically report having slept only four hours despite having slept a full eight hours.Insomnia Causes . Healthcommunities.com. Original Publication: 1 December 2000, Updated: 1 December 2007.
Human sleep-needs vary by age and amongst individuals; sleep is considered to be adequate when there is no daytime sleepiness or dysfunction Moreover self-reported sleep duration is only moderately correlated with actual sleep time as measured by actigraphy and those affected with sleep state misperception may typically report having slept only four hours despite having slept a full eight hoursInsomnia Causes  Healthcommunitiescom Original Publication 1 December 2000 Updated 1 December 2007