Sleep Paralysis

This is how Wiki defines Sleep Paralysis,

Sleep paralysis is a common condition characterized by transient partial or total paralysis of skeletal muscles and areflexia that occurs upon awakening from sleep or less often while falling asleep. Stimuli such as touch or sound may terminate the episode, which usually has a duration of seconds to minutes. This condition may occur in normal subjects or be associated with narcolepsy, cataplexy, and hypnagogic hallucinations. The pathophysiology of this condition is closely related to the normal hypotonia that occur during REM sleep.

In simple words,Its just some times when you wake up,you might not be able to move!Now you might have experienced this,if no then its ok.But next time if you do then don't miss the golden opportunity to AP.From this state its very simple to have a AP.All you have to do is try to open your third eye or you could just imagine of lifting off,chances are good that you find yourself in Astral World!!