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dont give me bull about how its all hallucinations; this music isnt possibly coming from my head; it varies too much in style. im eclectic but not THAT eclectic. what the heck am i hearing?
Well unless you have phantoms playing music just before you dose off it IS in your head. Your mind goes through different stages prior to sleep. First you get tired and ymaybe yawn. Then you feel relaxed and your body tells you to lay down Then you start to dose off and go through your sleep cycles where you dream and experience a variety of sensations from all your sense, most of which you won't remember in the morning. The thing is that just prior to actually losing consciousness you still retain a measure of alertness, a state of mind some might call the twilight zone.
Physiologically your mind is gearing itself towards sleep and to do this it has to shut down your ability to move - otherwise you would act out your dreams. Then your brain begins to send singles through all parts of itself stimulating the dream experience itself. It goes through five different stages to complete the dream cycle. The REM stage is where people experience the most vivid dreams and for a time it was thought people only dream during this period. But these days we now know its possible to dream at any point during sleep. Its just that few minutes where you are neither fully awake or asleep where you can experience dream like sensations. Music, voices, people calling your name, random sounds even visuals are normal.
WIth enough practice you can actually induce a lucid dream. It takes time to get ery good at and the first few times you succeed it will probably only last a few moments and you'll wake up. But basically just train yourself to recognize when you are falling asleep and rather than resist it try to flow with it while simotaneously focusing on the pre-dream content to retain consciousness. Now don't get all excited and think its just that easy. You are biologically hard wired to lose consciousness after a certain point. The catch is that genetics can be cercumvented through opperant conditioning and you can learn to control your dreams. TO condition yourself you basically prepare yourself throughout the day to fall asleep and have lucid dreams and you practice religiously.