I am 12 weeks and have the weirdest dreams ive ever had in my entire life!
As for sleeping, I toss and turn as well and found that instead of putting a pillow between my legs it helps me more to make an entire nest of pillows around my body. That way whichever way I turn I'm able to prop a leg up where and when I need to.
Reggae is a pretty soothing genre of music, I would say its perfectly fine to play it! A friend of mine plays a lot of pink Floyd and her baby seems to dance around and wiggle constantly when she does. I just wouldn't play anything crazy like metal or hard rockbecause that might be a little too intense for baby! Hope that helps!!