Actually, to my experience in helping others with astral projection, this isn't so much a sign of astral projection as it is a sign of etheral projection. The difference is that astral is rooted in a higher energy, whereas etheral is closer to the physical plane of existence. This tends to be why people feel like they can't move.
That, or it's sleep apnea. Sleep apnea is often the root of waking up and feeling like you can't move, combined with tingling and such.