You’re relaxing on the sofa when suddenly your eyelid starts twitching. Or perhaps it’s a muscle in your arm, your leg, or your foot that begins to spasm – sometimes for a few seconds, sometimes for ...

You're relaxing on the sofa when suddenly your eyelid starts twitching. Or perhaps it's a muscle in your arm, your leg, or your foot that begins to spasm—sometimes for a few seconds, sometimes for ...

Several things, such as caffeine and stress, can cause involuntary muscle spasms at night. Here’s what to know about twitching in your sleep. Have you ever suddenly been awoken by a quick jerk or ...