Nyquil pm. cheap and available
Benydryl knocks me the hell out, don't know how it affects you, but this leaves me groggy when I wake up too so it's not my favorite knock out pill
I tried melatonin when I had my business since I was like you, the wheels never stopped turning lining things up in my head for the next day/s/week/month and the second my eye's opened for whatever reason, BOOM, I'm awake even if I was still exhausted, the wheels turned all over again so ya lay in bed for an hour, two, three until ya dose off.
Now I'm at a "real job" working graveyard and I was only getting 5-6hrs/day sleep in 2-3 hr blocks due to taking kids to school/picking them up/other parently duties. Was able to to get a scrip for Ambien, it's a hypnotic that shuts your brain down...to stop the spinning wheels persay.
You pop a itty bitty pill and within about 30 minutes, lights out. Only downside is it is addictive, doc said your brain becomes used to being lulled to sleep artificially it then relies on it, so he told me only take them as a last resort; which I do, there are just some mornings I come home wired and I know I have to sleep right away since I have to wake up soon. Ambein makes me about half as groggy when I wake up as benedryl so it's better, but not groggy proof.