Personally, sleeping on my back makes me fall asleep way faster for some reason. Just feels more natural.

However, I’ve worked in the field of sleep medicine for like 9 years now, and sleeping on your back is a hot mess for many people. If you have obstructive sleep apnea, your sides or prone are typically way better for you respiratory-wise, neurologically, etc. than supine. Even if you think you’re getting a full night’s sleep, trust me…you’re probably not.