I don't know why but over the past month or two I've started falling asleep around six or seven pm and waking around midnight/ one to get ready for bed, then sleeping again till morning. I can't think of any particular reason for this, I've had relatively recent blood tests and any deficiency has been addressed. I shouldn't have diabetes, either, as that was ruled out but I guess I could recheck (I'm not eating any heavy meals or anything). I do exercise a lot but that is not new at all. Has anyone else had this and found out the cause?