like some of you mentioned:
*avoid naps past 1-2 pm
*ask your posek about music – the answer i got was one shouldnt’ listen stam whenever you want and lechatchila one shouldn’t wake up and go to slp with music but if you cant’ fall asleep one may listen. (and my posek is VERY machmir abt music in general)
*exercise has been proven to help one slp better however one shouldn’t do it 3 hrs or less before going to bed.
*once in bed breathe in and out slowly and try to relax