Like Bob said, all of that stuff is far more important.
I'm not taking anything specifically for sleep at the moment, but am dosing Strafe pre-bed along with 1 cap NaRALA and Abliderate Ammo.
I've used PowerFull, Somnidren, and a few others in the GH category before hand.
If I'm looking for something just for the best sleep and waking refreshed (not specifically targeting GH), Sleephoria does the trick for me. Have also used bulk GABA, too.