Sleep Depth

Sleep Depth

(dreams)

A person sleeping heavily is sometimes said to be in a “deep sleep.” In experimental approaches to the study of sleep, sleep “depth” has been gauged in terms of how much of a given stimulus (how loud a sound or how bright a light) it takes to awaken a sleeping subject. Empirical sleep research has found that we usually sleep deeper early in the evening and lighter toward morning, although this pattern is superimposed upon another pattern in which the depth of sleep varies across ninety-minute cycles. In a typical ninety-minute cycle, a sleeper goes through at least four identifiable stages of sleep, which repeat throughout the evening. Sleep is deepest in Stage 4, the stage during which we have the fewest dreams.

References in periodicals archive ?
Lower carbon dioxide levels [in the bedroom] implied better sleep depth, sleep efficiency, and lesser number of awakenings," Mishra's team reported November 22 in the journal Indoor Air.
The participants' subjective assessment of their sleep depth, which was obtained through questionnaires, correlated with carbon dioxide levels.
The experimental group reported significantly higher mean scores on improved sleep efficacy, sleep depth, quality of sleep, and ability to fall asleep or return to sleep after awakening.
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They plunge straight to a sleep depth it normally takes most people 90 minutes to reach.
These disorders of muscle movement result in arousal and awakenings that disrupt sleep depth and continuity.
05), including sleep quality, sleep depth, daytime alertness, ability to function, ability to think and concentrate clearly, and sense of well-being, versus those patients administered placebo.
The analysis showed that a mild to moderate correlation existed between patient-reported next-day function and patient-reported sleep parameters such as sleep quality, sleep depth, total sleep time (TST), WASO, sleep latency (time to sleep onset) and number of awakenings.
0001), higher ratings in sleep quality and sleep depth (p<0.