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NREM Stage 1 (N1 – light sleep, somnolence, drowsy sleep – 5–10% of total sleep in adults): This is a stage of sleep that usually occurs between sleep and wakefulness, and sometimes occurs between periods of deeper sleep and periods of REM. The muscles are active, and the eyes roll slowly, opening and closing moderately.
While the body benefits from sleep, the brain actually requires sleep for restoration, whereas these processes can take place during quiescent waking in the rest of the body. [98] The essential function of sleep may be its restorative effect on the brain: "Sleep is of the brain, by the brain and for the brain."
A delay, caused by light exposure before sleeping, means that the individual will tend to wake up later on the following day(s). The hormones cortisol and melatonin are affected by the signals light sends through the body's nervous system. These hormones help regulate blood sugar to give the body the appropriate amount of energy that is ...
Here’s a rough rundown of what happens in each one: NREM, stage 1: light sleep. About five percent of your total sleep time is light sleep. It happens as you fall asleep and drift away from ...
To ensure a healthy night’s sleep, the researchers suggest that people turn off all the lights, or have a dim one near the floor; eschew white or blue light, and keep that far from the person ...
“Maintain a dark bedroom environment during the morning to encourage sleeping in until your typical wake-up time,” she says. “Light exposure during the evening can help with staying awake ...
Unlike REM sleep, there is usually little or no eye movement during these stages. Dreaming occurs during both sleep states, and muscles are not paralyzed as in REM sleep. People who do not go through the sleeping stages properly get stuck in NREM sleep, and because muscles are not paralyzed a person may be able to sleepwalk.
Sleep happens in the context of the larger circadian rhythm, which influences sleepiness and physiological factors based on timekeepers within the body. Sleep can be distributed throughout the day or clustered during one part of the rhythm: in nocturnal animals, during the day, and in diurnal animals, at night.