Sleep
Sleep is a complex process that occurs in several distinct stages. Understanding the stages of sleep and sleep cycles is important for understanding the role of sleep in maintaining health and wellness.
There are four stages of sleep, which are numbered from one to four. Stage one is the lightest stage of sleep, and it is easy to wake up from. During stage one, you may experience muscle twitches, and your eye movements slow down. Stage two is a deeper stage of sleep, and it is characterized by a slowing of brain waves. During stage two, your body temperature drops, and your heart rate slows down. Stages three and four are the deepest stages of sleep, and they are also known as slow-wave sleep. During these stages, your brain waves are slow and regular, and it is difficult to wake up from.
Sleep cycles refer to the pattern of moving through these stages of sleep throughout the night. A typical sleep cycle lasts about 90 minutes and includes all four stages of sleep. For the first few cycles of the night, the majority of sleep time is spent in slow-wave sleep. As the night progresses, the amount of slow-wave sleep decreases, and the amount of time spent in REM sleep increases. REM sleep is the stage of sleep during which dreaming occurs. The first REM period of the night is typically short, but the duration of REM periods increases as the night progresses.
Overall, it is important to get enough sleep and to cycle through all four stages of sleep multiple times throughout the night in order to maintain health and wellness.
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