Just something to add to total eclipse's advice:
Since you've noticed things are starting to get strange with your sleep schedule, it's a good idea to start a log to keep trap of what's going on. Get yourself a notebook and keep track of the following things everyday,
Date:
Time you went to bed:
Time you actually fell asleep (if you remember):
-note any disturbances during sleep if applicable, if you got up a bunch of times etc.
Time you woke up:
Having this will help your doctor a great deal in determining what the trouble is.
Good luck. Circadian rhythm disturbances can be very rough to deal with, I know. :smile: