Under knees when on back. Between when on side. Have used a fleece sweater before but I often don't have one with me and when I do it goes in the Thermarest pillow case and under my head.
Do have some Graham FlexAir pillows. Sure I could combine a couple/few inside a stuff sack of the right size and get a workable solution but I doubt it would be as comfortable and definitely more hassle. With all the money I've spent on outdoor gear, $20 for a good pillow that helps me get a good nights sleep isn't something I'm going to sweat.
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