I kind of have trouble with my sleep. I sleep wonderfully (8-17 hours; yes, 17, not very often though, on average 11), but I think (or thought?) I have mild free-running sleep disorder, where I go to bed later and later each day (if I didn't manually control it, I'd have a full 24 hour cycle over the course of a few weeks). But I've never thought about pop being the cause. I'll try and ditch it, see if it makes a difference!