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The primary difference appears to be that pre-light cultures have more broken-up sleep patterns. For example, people without artificial light might go to sleep far sooner after the sun sets, but then wake up several times throughout the night, punctuating their sleep with periods of wakefulness, perhaps lasting several hours. [147]
We get into a pattern of waking and sleeping that sees us opening our eyes in the middle of the night. The room is dark, but sure enough, the clock reads the same time as it did the night before...
Polyphasic sleep is the practice of sleeping during multiple periods over the course of 24 hours, in contrast to monophasic sleep, which is one period of sleep within 24 hours. Biphasic (or diphasic, bifurcated, or bimodal) sleep refers to two periods, while polyphasic usually means more than two. [1]
“It’s actually normal to wake up several times per night, but awakenings need to be more than three to five minutes long to be remembered the following day,” says Dr. Audrey Wells, MD, a ...
One of the important questions in sleep research is clearly defining the sleep state. This problem arises because sleep was traditionally defined as a state of consciousness and not as a physiological state, [14] [15] thus there was no clear definition of what minimum set of events constitute sleep and distinguish it from other states of partial or no consciousness.
Waking up in the light: cortisol awakening response is larger when people wake up in light rather than darkness. [14] [15] Noise: there is no cortisol rise after nights with traffic-like low-frequency noise. [16] Alarm clock vs. spontaneous waking: there is no difference on days when people woke up spontaneously or used the alarm clock. [3]
in the U.K. for less than a year and living together only a couple of months, having met shortly after we both arrived from the States the previous spring. Perhaps I needed a bit of distraction, as I’d given up smoking the night before and had made such a public fuss there was no turning back. Or maybe it was the thought of the new decade ahead.
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