If you’ve ever found yourself drifting off to sleep only to be woken by a vigorous, full-body twitch or jerk, don’t feel alarmed, reports USAToday.com.

Sleep is one of the most important things we overlook, because most of us don’t consider it vital. The problem isn’t you — it’s your brain. Brain scientists really don’t know what they are talking about when it comes to sleep. For far too long, we have known too little about why we sleep. Instead of acknowledging that fact, scientists have made up fairy tales to explain our need for sleep.