I discovered that my circadian rhythms are such that I need to get to bed by midnight, or I miss my first sleep cycle, in which I get the bulk of my deep sleep.
While these results are in contrast with Ramanathan's report of an increase in brain anti-oxidant responses in the setting of short term sleep deprivation [ 41], the bulk of the data suggest that sleep is a time for the brain to buffer the oxidative load imposed by wakefulness.
Senior experimental psychologist John Caldwell has spent the bulk of his career researching the effects of sleep deprivation and sleep restriction, while also studying countermeasures that sleep-deprived people can use to function better.
REM sleep, the bulk of which comes later in the night, seems important for pattern recognition — for learning grammar, for example, or to bird-watch, or play chess.
Habituation of sleep is improvement of sleep quality.
Other parameters of sleep EEG were unchanged.
Habituation of sleep to a ship's noise was assessed by actigraphy and a sleep questionnaire.
The polygraphic sleep parameters were six sleep stages in minutes, sleep latency, REM latency, REM cycle, REM duration, frequency and duration in minutes of awakening during sleep, total sleep time, number of sleep stage shifts, sleep efficiency, number of sleep spindles and density.
Obstructive Sleep Apnea: Epidemiology of Sleep Apnea.
The existence of poor quality of sleep, fatigue, insomnia or different alterations in sleep structure, organization and sleep cyclicity have been established.
