Do you mean like sleep paralysis? I get these episodes once a month or so where my body goes to sleep, but I'm mentally awake, and I can't move my body, and I start to have vivid dreams, the type of dreams that blow hallucinogenic trips out of the water--sensory overload. It's pretty cool, once you get used to it, but scary at first cuz you have no control over your muscles for a short period of time and the dreams are soooooo real. Doctor told me it's not dangerous and that a small percentage of the population experience this. Does anyone else experience this?