Hi, whitediamond. There's a possibility that you may have sleep apnea. If you do, you're not going into REM sleep completely for any real period of time during the night and that's the most important stage of sleep for us. You'll need to have a sleep study done to determine this. All it includes is going to a sleep study center (which may be at your hospital) and sleeping there one night. They will hook you up to electrodes and will watch and listen for any problems. If you do have it, you'll need to get a CPAP to wear at night. I have one. I used to be so tired during the day I could hardly move and had to take usually 2 naps a day. Now I don't need any. Talk to your doctor about it, honey, and see what he thinks. :-)
Are you eating enough of a variety of foods to get the proper amounts of vitamins, minerals and roughage that you need? Are you getting enough exercise? These are simple, easy to fix things that can cause fatigue. If a change in exercise and diet doesn't help, you should consult an MD for a check on your general health.