How much sleep do you really need?

How much sleep do you really need? Learn ideal sleep solutions in this video. 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.
Researchers have found that sleeping 6-7 hours each night correlates with longevity and cardiac health in humans, though many underlying factors may be involved in the causality behind this relationship.
Sleep difficulties are furthermore associated with psychiatric disorders such as depression, alcoholism, and bipolar disorder. Up to 90 percent of adults with depression are found to have sleep difficulties. Dysregulation detected by EEG includes disturbances in sleep continuity, decreased delta sleep and altered REM patterns with regard to latency, distribution across the night and density of eye movements.
Sleep duration can also vary according to season. Up to 90% of people report longer sleep duration in winter, which may lead to more pronounced seasonal affective disorder.
Co-sleeping
Hypnogram
Microsleep
Morvan's syndrome
Oleamide
Power nap
Rheum
Sleep epidemiology
Sleep in space
Sleep-learning
Sleep medicine
Sleep paralysis
Sleeping positions
Somnology
Somnophilia
Start school later movement
Sudden infant death syndrome
Sudden arrhythmic death syndrome
Unconsciousness
Yawn
Yoga-nidra
This video used the following article under Creative Commons - CC BY-ND 4.0 DEED: "How much sleep do you really need? (theconversation.com/how-much-...) Dana McMakin, Associate Professor of Psychology, Florida International University (Published: May 10, 2021); slight stylistic modifications to original text.

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