Naltrexone
"Since I began taking 5 mg naltrexone at night, I fall asleep quickly, I sleep very well for 8 to 9 hours. I wake up refreshed and without pain.  I no longer take antidepressants, sleeping pills, anxiety or pain medication. My mental functioning is much better but not back to Pre-CFIDS standard. I don't have normal energy or drive but my life is so much closer to normal than it was a year ago, I have no complaints.  The only other medication I take is for high blood pressure. The only side effect I have is a slight headache when I wake in the morning but it ALWAYS goes away soon after I get up.  I would take this medication if the only thing I got from it was good quality sleep."