Use a comfy pad. Seems obvious, yet as UL people we tend to eschew the comfort for less weight. My pads are at least as comfortable as my bed at home. Deep, deep winter an Exped Downmat9. Early/late shoulder season, women's Thermarest Trail Pro (about 35% warmer than the men's version), summer & tail end of shoulder season Neoair. Even with the two heavier pads I'm still right around 10 or 12 pounds base.
Have enough of something to make a decent pillow. If you're with a tent partner, carry some foam ear plugs (I could never sleep through the snoring before). I do take Benadryl at night, partly for the sleep effect, but more so because I have severe allergies and can't take the Benadryl during the day… extension of that thought being that if you have allergies, post-nasal drainage and such can interrupt good sleep. I also would encourage incorporating some kind of bedtime ritual that you follow both at home and on the trail. In other words, regardless of where you go to bed, you brush your teeth, get your final drink of water, take your final bathroom break, etc in the same order. Part of good "sleep hygiene." If you have a night-time appropriate beverage that really makes you happy, make having some of that part of your pre-bed ritual.
As to the pad and actually sleeping, make sure you can comfortably sleep in the backcountry the same as you sleep at home. In other words, if you sleep on your side at home, make sure you can comfortably sleep on your side in the woods (both pad and enough pillow support). Get a sleeping bag that'll keep you plenty warm, but not too hot… depends on how you tend to sleep…

