![]() ![]() 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. What Stage of Sleep Is Most Important? NREM vs REM Sleep ![]()
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