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The NSF Sleep in America poll began providing evidence of the size and scope of the American sleep problem in 1991. The 2002 Sleep in America poll (1,010 people surveyed) first suggested that as many as 47 million Americans were risking injury and health problems because they were not sleeping enough. [7]
Sleep deprivation, also known as sleep insufficiency [2] or sleeplessness, is the condition of not having adequate duration and/or quality of sleep to support decent alertness, performance, and health. It can be either chronic or acute and may vary widely in severity.
Sleep efficiency (SE) is the ratio between the time a person spends asleep, and the total time dedicated to sleep (i.e. both sleeping and attempting to fall asleep or fall back asleep). It is given as a percentage. [1] SE of 80% or more is considered normal/healthy with most young healthy adults displaying SE above 90%.
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Irregular sleep schedules can cause negative impacts on learning, memory, and performance. The dual process theory determines that certain types of memory depend on specific sleep states, like REM and NREM (Non-Rem) states. REM sleep deprivation can reduce sleep-induced improvement such as visual perception, thus influencing how one learns.
Sleep is divided into two broad types: non-rapid eye movement (non-REM or NREM) sleep and rapid eye movement (REM) sleep. Non-REM and REM sleep are so different that physiologists identify them as distinct behavioral states. Non-REM sleep occurs first and after a transitional period is called slow-wave sleep or deep sleep.
America's Health Rankings started in 1990 and is the longest-running annual assessment of the nation's health on a state-by-state basis. It is founded on the World Health Organization holistic definition of health, which says health is a state of complete physical, mental, and social well-being and not merely the absence of disease or infirmity.
Adolescent sleep is typically poor in duration and quality. Sleep duration and quality reduce to suboptimal levels, and sleep duration variability and latency increases during adolescence. [1] Sleep recommendations suggest that adolescents should obtain 8–10 hours of sleep per night.