Quote Originally Posted by paigeyemps View Post
HI is hypnagogic imagery (sometimes called hypnagogic hallucinations or HH). It's those random, drifty scenes/blobs/objects/images you see flashing before your eyes as you start falling asleep Hypnagogic hallucinations may be auditory as well. You might notice some strange sounds that aren't really there as you start drifting off to sleep.
They're different actually. Hypnagogic Imagery is the scenes specifically behind your eyes. Hypnagogic Hallucinations are noises you hear or things you see when you open your eyes.