Describe the sleep cycle from start to finish
What will be an ideal response?
ANSWER:
Over roughly a 90-minute period, we go through a sleep cycle that consists of four non-REM (rapid eye movement) stages and a stage of REM sleep. These non-REM stages start with stage I sleep, which is marked by theta brain waves and a slowing of breathing and heart rate. This first stage is one where we can easily be awakened from, and often report a sense of floating or falling. After stage I, we enter stage II, which displays even further slowing of heart rate, breathing, and decreasing of body temperature as well as brain wave patterns that include sleep spindles. Stage III sleep is a brief transitional stage into stage IV, or, deep sleep in which the brain shows delta waves. In stage IV it is difficult to be awakened. We then revisit stages II and III of non-REM before entering a brief period of REM sleep. REM sleep is a very active state of sleep in which brain waves actually look like we are awake. It is in REM sleep that we experience most of our dreaming, though our body itself is paralyzed and we experience increases in respiration and heart rate.?
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