Have you ever woken up to the feeling that a huge weight was sitting on your chest, rendering you unable to move? There’s a name for this phenomenon—which is scientific, not supernatural—’sleep paralysis.’ People afflicted with sleep paralysis are actually trapped in a state somewhere between sleep and wakefulness. What feels like a struggle to move, is actually a struggle to wake up. Experiencing the affliction often inspires sufferers to investigate paranormal causes, like Blake Smith, the man profiled in the Q&A below, but scientists insist there’s a clear biological explanation (no ‘X Files’ style inquiry necessary). Doctors say there’s no surefire way to avoid sleep paralysis, but good sleep hygiene—no food, screens or scary movies before bed—is a good way to start. Have you ever experienced this eerie state? Share your experiences in the comments.