Last night, as I was falling asleep, I got this weird tingling sensation in my hands and feet. As this feeling persisted, my bed started to feel like it was shaking and rocking, and after this feeling went on for a couple of minutes, my foot sort of jerked and hit the bed, and the sensation went away. This feeling happened again as I started falling asleep the second time, only this time I actually did manage to fall asleep. Does anyone know what this was? I've never experienced anything like this before, so I thought I'd ask.