This is the “hypnic spasm”, that is, an involuntary contraction: 7 out of 10 people have tried it at least once in their life.

This phenomenon is caused by stress, physical fatigue, sleep deprivation or caffeine abuse.

Do you know “sleep starts”?

It is the feeling of falling into the void while sleeping. It is an involuntary contraction: 7 out of 10 people have tried it at least once in their life. This phenomenon is caused by stress, physical fatigue, sleep deprivation or caffeine abuse.