I tried both quilts and sleeve bags, both worked but wasn't great. I finally got a Nemo spoon bag this year and finally fits my style of sleep. I can toss and turn all night, not get cold from drafts, side sleep(insulation all around)and has the most leg room I've found in any bag. To me it's worth the extra pound.
A thicker sleeping pad will help, there's a couple 4" out there but really it's only going to do so much at high altitude. I read a study that showed the effects of sleep in places other than your bed, this was in hotel rooms, that the first 2 days most people got horrible sleep no matter what. Naturally you body goes into high alert mode subconsciously. I can't imagine what sleeping in the wilderness at high altitude coupled by hunting does to your body. That being said I noticed if I can keep my tent in the same spot over the entire hunt I get better sleep. I also try get a 2 hr nap in around noon if things are slow. I never use sleep aids but when I'm in the backcountry I'll take 2 Tylenol pm at night. Tried melatonin, it's given me ultra weird dreams every time. Obviously dehydration is an issue, peeing out my bag in a floorless is a must nowadays.
I also listen to a book on tape from audible.com on my phone, stops my mind from racing. I have only ever hunted solo, which also adds another level of alertness but I feel ya man, it can be hard to sleep.
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