So, according to the expert, at night the chances of having nightmares are higher. He also noted that fears are formed during slow wave sleep, often in the first third of the night. At the same time, people who suffer from severe apnea with respiratory arrest may have nightmares both at night and during the day.
Kalinkin said that sleeping during the day, if it does not go beyond 30 minutes, can refresh a person. Sleeping longer than half an hour is fraught with undesirable consequences.