Light sleep generally covers 50-60% of the night. After this stage, you can still be easily awakened. This is generally a relatively short stage, lasting between 1 and 7 minutes. The brainwaves that are associated with a relaxed wakeful state-called alpha waves begin to subside during this stage, giving way to brainwave frequencies called Theta. You begin to feel your muscles relax, and drowsiness may overcome you as you sink into your pillow. Sleep onset, the process of falling asleep, is apparent at the start of every sleep cycle. This is the transitional stage between wakefulness and light sleep. Let’s dive into our guide to what your body is doing during these stages of sleep and why they are so important. While you’re snoozing, you usually go through 4-5 sleep cycles that begin in light NREM sleep and end in REM sleep with each cycle taking between 70 and 120 minutes to complete. This typically takes place during the last half of your night’s sleep. REM (Rapid Eye Movement) sleep is where you may spend some of your time dreaming. Non-REM sleep (sometimes called NREM), which includes light and deep sleep, accounts for about the majority of your sleeping time. All are important to your overall sleep health, but the two main types of sleep that we’ll focus on in this article are Non-REM and REM. The sleep stages consist of transitional light, light, deep, and REM sleep. It’s also important for memory consolidation, processing what you learned the day before, and other important cognitive functions. Your brain doesn’t shut down during sleep rather, your brain is involved in a wide variety of vital processes geared toward its own repair and rejuvenation, restoring stamina, strength, and function to prepare for the day ahead. Sleep is an active state that is, in some ways, as complex as wakefulness. Finally, zolpidem had no effect on REM sleep temporal distribution.Share on Twitter Share on Facebook Share on Linkedin Share via Email Stages of Sleep Guide: Non-REM & REM Sleep CyclesĮven though sleep seems like a passive process, it’s not. Study of the rapid eye movements-non rapid eye movements (REM-NREM) sleep cycles structure showed that the increase of stages 3 and 4 occurred only during the first part of the night. Zolpidem did not increase specifically stage 2 to the detriment of stages 3 and 4 but it restored them during the first nights of administration. During the first post-drug night a rebound insomnia was observed in two subjects only. It reduced sleep latency, increased total sleep time and decreased the number of awakenings during all recorded nights. Zolpidem 10 mg showed a hypnotic effect on poor sleepers. Parameters of sleep continuity, sleep architecture and cyclical structure of sleep were studied. Polygraphic recordings (conventional analysis) were performed on nights 1-6 12, 13 19-22. Placebo was given orally at bedtime on nights 2-4, zolpidem on nights 5-20 and finally placebo on nights 21-22. Subjects were recorded according to a 22 day single blind study. Effects of zolpidem, a short acting non benzodiazepine hypnotic, have been studied in eight female poor sleepers, aged 25 to 54 years, documented during two consecutive adaptation nights.
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