Summary: The makura gaeshi or pillow flipper, was thought to cause kanashibari--sleep paralysis. It happens when you believe you've woken up in bed, but you're actually somewhere between wakefulness and sleep. You’re aware of the room around you, but there's a subtle change in the air. You try to move, but you’re frozen. You try to call out, but you can’t make a sound. It’s a terrifying experience.
