I use a Thermarest Prolite 3/4 length. Under that I use a Ridgerest closed-cell full length that I have cut so the I can use part of the Ridgerest and the Thermarest in my camp chair. I had a couple back surgeries, so I need all the help I can get for my back! I also am a side sleeper - and it seems that this combination works very well for me.

I also take 1 benedryl and 1 ibuprofen about 20 minutes before hitting the sack, and that really does wonders for my sleep!