Describes the stages of sleep
Most people think that when we sleep, we can shut down our mind. However, with the power of advanced technique, scientist made a careful observation of human brain waves, body temperature, heart rate, breathing, and other physical functions. They received a new light on sleep. Our brain and body actually are active during sleep, sometimes even more active than we are awake. There are two type of sleep, making up a complete 90 to 100 minute cycle that can be repeated 4 to 5 times in an average eight hours sleep. NREM (nonrapid eye movement) sleep: also called quite sleep. Have four stages, from stage 1 to stage 4.REM (rapid eye movement) sleep: also called active sleep. Stage 5, in this stage you dreaming.( Cherry, K.2012) During sleep, we usually pass through five stages of sleep:
Stage1. Light stage of sleep.
Turn off the light, close your eyes, and find the most comfortable position to lying down on the bed .While, you may feel sleepy now. Your eyes start moving slowly, muscle activity slows and body feel more relaxed. You had already entered stage 1 sleep without noticing it. At this stage, you may be aware of noises. You can be easily awakened and may feel that you are not really sleeping. During stage 1, our brain activity slows down; brain produces waves from alpha waves enter to theta waves. (Rathus, S.pp.100).
Stages 2. A light sleep but it is deeper than stage 1.
Stage 2 may last for 20 minutes.Your brain starts producing more waves but activities become lower. Your eyes stop moving; breathing, heart rate slows and body temperature decreases. Right now, you are ready to enter deep sleep. During stage 2, the brain waves are interrupted by bursts of brain activity knows as sleep spindles.( Rathus, S)
Stage 3 and 4. Transition period between light sleep to deep sleep. At stage 3, you deep sleep starts, your brain produce slower delta waves. There is no eye movement and you will not consciously trying to move your...
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