Doxepin
"I've had sleep issues for years and after having multiple sleep studies done as well as nasal surgery to fix deviated septum, I tried a dental sleep appliance and a c-pap machine and nothing worked. I was finally given Doxepin - OMG LIFESAVER...6 drops per night and I am out like a light wake up around 5 hours later but refreshed and not tired. However, if I go off routine, as in different time-zones, late nights, it does take a while to get back on track...I'd be in a mental health institution if I hadn't found this as I was at the end of the rope and couldn't cope anymore being constantly exhausted."