Another possible component to the back sleeping question .....
So I've always had a hard time staying asleep. Noises wake me easily unless they're very specific, like rain. I decided to look at why some people might be able to sleep through lots of noise and others have trouble sleeping through noise.
I found this:
It says that the thalamus produces certain brain waves called spindles and when these are adequately produced, outside noises don't wake you. And people who don't produce as many are more likely to wake up from noise. The thalamus is stated as the same part of the brain that takes in sensory information and relays it to the rest of the cortex. I find this connection very interesting because I've wondered if I myself have SPD and noise wakes me up (and auditory input is what I'm most sensitive with).
So for those of you who have kids with lots of sensory issues, do they need it real quiet to sleep or some sort of sound machine so that no other random noises interfere and wake them?