Is the problem that you fall asleep OK but wake up and still feel tired, like you didn't sleep? Or do you have trouble falling asleep?
If you have trouble falling asleep, Bourbon is wonderful stuff...
If you sleep but not well. Do you snore? Does your wife/SO/whatever notice that you stop breathing in your sleep? If so,
"Obstructive Sleep Apnea"
Get it treated, over time it can lead to high blood pressure, CVA'a and other cardiac problems.