Hi Corrina, I am exactly the same. I could go to sleep at 10, sleep till noon and go back for a couple of hours nap in the afternoon. Claire Weekes exlains this well in her book and it has to do with the mental, spiritual, physical and emotional fatigue. Another reason I slept alot was because it was a form of avoidance. Some people take drugs, alcohol etc but I slept! I am still dealing with my tiredness and fatigue but the best advice I can give is; Stay off the bed during the day, keep sleeping patterns regular and keep occupied during the day. Boredom is another thing that can make you want to just go and sleep. Exercise is also good but it can be hard if after five minutes your muscles grow tired and you feel lethargic. Baby steps is all it takes to start out though!! I'm up to doing about 40mins exersise every two days now and it is very beneficial.
Hope this helps!!