![]() The actual time spent in each N2 stage is about 20 minutes, but in this relatively brief period, your body physiology is adjusting downwards in preparation for sliding into the actual restorative later stages of sleep. The greatest amount of sleep time approximately fifty percent of the total is spent in Stage 2 sleep. Stage 2 (N2) Sleep: Light Sleep, Non-REM 2 Your brainwave activity will show primarily a relaxed, quiet head, with occasional blips of alpha waves that characterize an awake, alert mind. Stage 1 sleep may be described as light, shallow, or transitional, making it easy to wake up. For example, your 90-minute sleep stage map may typically read as follows: In addition to marking the beginning of your sleep period, Stage 1 sleep also occurs between each subsequent stage of sleep. ![]() Taking up about five percent of our total sleep time, Stage 1 sleep lasts for about five to ten minutes at a time. Stage 1 (N1) Sleep: Light sleep, nonREM 1 ![]() What are the differences among the four stages of sleep?Īll four stage of sleep are essential and serve different purposes. People normally experience three or four sleep cycles per night, their bodies automatically advancing through each stage in sequence, and waking naturally after approximately eight hours.Īlthough nobody knows exactly why most living things sleep, medical research suggests that time spent sleeping is essential for performing essential maintenance and repair within the body. Together, these four sleep stages make up a single sleep cycle, lasting between 60 and 90 minutes each. Stage 3 (N3)Deep sleep, no REM (formerly N3 & N4).Stage 1 (N1, or non-REM 1)Light sleep, no rapid eye movements (REM).Now, nearly a century later, researchers have refined those discoveries into four well-defined sleep stages : Based on EEGs (electro encephalograms) of their nocturnal subjects, sleep researchers discovered distinct, measurable changes in both the body and brain, occurring regularly and predictably throughout the night. Since the 1930s, modern medicine has known that a full nights sleep is not a single, continuous experience. "The longer you spend in deeper sleep, the more refreshed you'll feel in the morning," she says.What Stage of Sleep Is Most Important? NREM vs REM Sleep But, in general, people alternate among several different levels of non-REM and REM sleep every night. ![]() Krahn says not everyone goes through all of the stages. "They're paralyzed, and that's actually felt probably to be a rinsing function - to clear the brain of toxins and byproducts that have collected during the waking day."ĭr. "Things speed up except a person cannot move," says Dr. The final stage is REM sleep, which is typically when you dream. "And that just allows the body a chance to recover from the busy day." "When we're in deep sleep, our heart rate and our breathing really slows down," says Dr. Krahn says the three types of non-REM, which stands for rapid eye movement, include level one, which is light sleep level two, intermediate sleep and level three, deep sleep. Lois Krahn, a Mayo Clinic sleep medicine specialist.ĭr. "We basically divide sleep into wake, non-REM - three types - and REM sleep," says Dr. When your head hits the pillow, your body can go through several stages of sleep. Journalists: Broadcast-quality video pkg (1:00) is in the downloads.
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