A<unk>  or hypnagogic<unk>  is an involuntary muscle twitch (commonly known as a myoclonic twitch) which occurs during the transition into hypnagogia.
It is often described as an electric shock or falling sensation, and can cause movement of the body in bed.<unk> s are experienced by most people, especially when exhausted or sleeping uncomfortably.
Hypnic jerk
Choking
Kussmaul breathing
Valsalva maneuver
Concussion
Shallow breathing
Hyperventilation
Aerobic exercise