Tayola, I realize your post was from awhile back but.......
Have you considered having a sleep study? It is possible you may have sleep apnea or other medical issues. Consider 1st going in to see your regular doctor to rule out thyroid issues, etc. Also, are you on any meds that might cause fatigue, sleepiness,etc? I have a similar prob w/ hypersomnia I was diagnosed w/ sleep apnea 11 yrs ago and now sleep w/ a CPAP (Continuous Positive Airway Pressure) machine. It helped immensely since my apnea was pretty severe so I wasn't getting into the deeper stages of sleep. I still cant go a night w/out wearing the machine but I still can sleep 12 plus hrs a night if I didnt need to be up for work, etc. So on my days off, I feel like crap after oversleeping. Partially for reasons of guilt. Makes me feel like a lazy bum
But it is a vicious circle regarding getting up and moving or staying active. When you lay around all day, you feel even more tired and less motivated.....i know, easier said than done. But once you get the ball rolling as far as exercising it becomes easier. "You must expend energy to get energy." So exercising gives you more energy, not less. Sure, you're tired afterwards...physically, but wide away mentally and the great chemicals (endorphins) are a nice legal drug
Coffee is a great cup of motivation too. Good luck and keep us posted.