Why do my quads twitch rapidly when I lay down completely flat on my back?
1. Introduction Rapid twitching of the quadriceps when lying completely flat on the back is typically a manifestation of benign fasciculation syndrome, driven by localized muscular fatigue, systemic stress, or electrolyte imbalances. When the legs are fully extended and physically unloaded by the mattress, the large muscle groups transition from bearing the entire weight of … Read more