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In some cases, your increased activity during sleep and waking may be due to the fact that before you went to bed, you were engaged in self-satisfaction. This is quite a rare case, but it is possible. In your sleep, you may fall off the kravati, and before you wake up, you may start tossing and turning like a spasm, and your breathing will also become faster. This state can last from 5 to 30 minutes. After you wake up, you will have acute headaches for a while. This phenomenon is quite rare and absolutely harmless for organdism. This can be prevented if you take a little walk or drink half a glass of water after self-satisfaction.
Because sleep is the triumph of inhibition over arousal.
To explain in more detail, we need to understand what happens when we go to bed.
There are two phases to sleep: the slow-wave phase (one if you combine all its stages) and the REM sleep phase. During the slow-wave sleep phase, the body relaxes, and it is characterized by a decrease in brain and muscle activity. Even so, we may be unconsciously moving. During this period, we are able to twitch our limbs, unconsciously change the position of the body in a dream, changing an uncomfortable position. Or, for example, throw off a blanket or cover yourself with it when we feel fluctuations in the temperature in the room. Provided that a person's physical and mental state corresponds to the norm, he is not able to take more active actions during this phase, since his muscles are relaxed. If something is wrong, it is during this period that sleepwalking, snoring, talking in a dream, as well as enuresis in children can occur. Precedents also occur when the sleeping place is mobile or unusually narrow for our body (think of people who fall off the shelves in a train car). Being in more or less comfortable conditions, a healthy person is unlikely to fall out of bed, since his body is at rest and is not capable of active actions.
Next comes the REM sleep phase and the activity of our brain increases. It is characterized by rapid eye movements (it is also called the stage of rapid eye movements, abbreviated REM sleep), as if you were watching a movie in reality, and sharp bursts of brain activity. Interestingly, the rapid fluctuations in brain activity observed during this phase are similar to the fluctuations in the brain of a waking person. That is, during this period, despite the fact that your body is resting, in fact, a full-fledged mental activity occurs in the brain. Studies have shown that subjects who were woken up during this period, in 90% of cases, told about the vivid dreams they saw. So why don't we fall out of bed during this rather active phase of sleep? Because it is at this stage that our body is naturally paralyzed. This is an evolutionary response of the body that blocks the body's attempts to respond to an imaginary picture (dream) with physical action. A defense mechanism that nature uses to protect us from the damage we can do to ourselves or others when we dream about something that seems real. The body is completely paralyzed, only the eyeballs and chest muscles move, allowing you to breathe. Some people are familiar with the state when, when they wake up, they realize that they can not move, even take a deep breath. This is a manifestation of sleep paralysis, but in this case, muscle paralysis occurs before falling asleep, or awakening occurs before it subsides. For comparison, when you're tired, driving in public transport, nodding off, and then pass out and drop your head on your chest, this is not a REM sleep. If you were in REM sleep, you would fall out of your seat, because at this stage, muscle tone abruptly disappears. Similar symptoms occur in people who suffer from narcolepsy – a nervous system disorder that is characterized by cataplexy, a sudden loss of muscle tone. Provokes an attack, usually an emotional outburst: fear, joy, embarrassment, anger. For example, here is a person meeting with old friends. He's happy, smiling, and suddenly collapses to the floor. I emphasize that he is conscious, hears and understands everything, but cannot move until his muscle tone is restored. Studies have shown that the same paralysis covers the body of a healthy person in the REM sleep phase.
It is also worth noting that if you exclude sleepwalking and disorders such as REM sleep disorders, which still belong to sleep disorders, sleeping people do not move much. At this time, our body rests, the brain processes the information accumulated during the day, and the immune system is effectively restored. During sleep, our motor centers slow down, which helps the body relax completely and saves energy for more important brain activity during this period.
Due to the above factors, a healthy person is unlikely to fall out of bed at night, because his body itself knows perfectly well what a good rest is:)