While most people are sleeping the REM sleep, also known as rapid eye movement, occurs around every 90 minutes throughout the entire night (and occurs around every one hour and small children and babies). The first REM. That you go through during the night is very limited, approximately 5 minutes long. The second REM. Of the night usually last around 10 minutes. And the third REM that you go through each night is around 15 minutes. The final dream of the night (when you drain you are in REM sleep) usually lasts a round 1/2 hour, but sometimes can last a full hour. Everyone trains multiple times throughout the night. If you slept around 5 to 6 hours last night, you can be sure you had approximately 4 to 5 drains. Most of the dreams that you had were forgotten, however, unless you were awakened while having them.
On the other hand, NREM sleep (which is non-REM sleep) comes in two different variations. The first variation which is the most frequent variation, is called stage two. The second variation which is the much deeper version, is called the delta sleep (it's also referred to as stages three in stages four). Your mind does think a little bit during NREM sleep, but it is usually quite simple and often fragmented.
There is also a phase of transition between being asleep and waking up, when some parts of the brain are still asleep while other parts of the brain are not. This is referred to as stage one sleep.
Following the sleep is like walking down a stairway. You begin going down into stage one sleep for the first half minute to the first several minutes, with your various thoughts drifting, but this point you still don't fall asleep. Then you walk down the stairway a little further into stage 2, in your mind begins putting out waves with patterns that are characteristic called sleep spindles and K-complexes. Then, you walk down to the end of the stairway where you come into deep stage three and four which is delta sleep.
Sleep researchers call the time to the end of the first REM sleep the first sleep cycle. Then from the end of the first sleep cycle to the beginning of the second REM sleep cycle is called the second sleep cycle. Your body will go through four to six sleep cycles per night, depending on the link the time that you are a sleep. Usually there is a gradual change between sleep stages, with one stage blending into the next stage as you gradually move through the stairway. In the final part of the night, there is no Del to sleep at all.
Among sleep researchers these points are still up to debate. The important thing that you should know is that it doesn't matter what stages of sleep that you're having, but what matters is the quality and the amount of sleep that you're getting. It is important that you do not have too much stage one sleep and that your sleep as a continuous movement down the stairway, and not fragmented with different interruptions and awakenings. This is why most researchers at sleep clinics are far more concerned that you sleep well rather what sleep stage that you are particularly in.
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