Lately, I've been sleeping very, very much. Like 9-12 hours at a time. I slept till 3pm yesterday. I usually sleep late, but this is bad. I also am, suddenly, a VERY deep sleeper. I used to be a pretty light sleeper (i.e. if my phone went off - even on vibrate - I could hear it and it would wake me up). Now, if the ringer is on high and right next to my head, either I sleep through it or turn it off in my sleep.
I'm constantly tired, even though I get this much sleep. It happened suddenly and I'm quite worried.
Does anybody know what could be wrong with me?