When the night is quiet and we are about to fall asleep, our body often twitches suddenly. This type of twitching is usually called sleep dyspepsia (also known as sleep onset) by scientists. At present, there is no research to fully understand the reason, so people have many speculations about it. There is an explanation that the human brain is based on the evolution of the reptile's brain, so it still retains a part of the reptile's stress response mode. When the muscles are completely relaxed, the brain will think that we are falling freely based on this stress response pattern. For self-protection, the brain directs the muscles of the whole body to act immediately, trying to grasp something during the fall, so it is already relaxed. The muscles will tighten suddenly, causing twitching when falling asleep.
text describe?
Provide an explanation for sleeping dysphoria.