Loose clothing, empty bladder, clean teeth, comfortable pillow, audiobook of something longish and reasonably involving and comfortable headphones, listen at a fairly low volume so that as you start to relax, if you do doze off the recording won't wake you up again. And if you don't doze, just try to relax and enjoy being read to. I like a red wine and a Baileys as well, but this doesn't work for everyone.