Sleep myoclonus is involuntary, nonrhythmic muscle twitching that occurs either as a person falls asleep or during sleep. The movements include hiccups, starts, and jerks. Sleep myoclonus is not a ...

Hypnic jerks are common, sudden muscle twitches that happen when you fall asleep. Stress, anxiety, and fatigue can increase the chances of experiencing sleep starts. Sleep starts are harmless but can ...

Myoclonus is a sudden, random muscle jerk. It can happen alone or stem from a medical condition. Possible causes include medication side effects, damage to the nervous system, and disorders that ...