This sounds a lot like me. I go through 'phases' where I can sleep 18 hours a day and have no energy for anything at all, as well as being super-spaced-out and disconnected from everything and disoriented.
The only thing that doesn't match up is the hypersexuality.
Iiiinteresting.
_________________
~I wanna fly high, so I can reach the highest of all the heavens
Somebody will be waiting for me, so I've got to fly higher~