Ever had a sleep apnea test? Best thing that ever happened to me; it corrected a loss
of REM sleep (which "charges our batteries"), and corrects problems in our sleep cycles with
treatment. My doctor recommended it; barring that, some of use Klonopin (Clonazepam) as a sleep aid. That helps.

And "the lemon thing" will work after a day or so of trying it if you wish.

Hope you find the answer.