I feel the same, a good pillow can make your nights much more restful. It seems like traditionally people just put their fleece jacket in a stuff sack and use that…but I like to wear my clothes to bed. I have been using a camelbak bladder lately but it is kind of narrow so it takes effort to keep your head on it. I’ve been thinking about simply piling up some dirt and duff under the head end of my bivy sack and using that as a pillow, but we’ll see how well that works. In the book Beyond Backpacking there are directions in the back for making a stuff sack that you can supposedly blow up “like a beach ball”, so maybe if it were the right dimensions it could work double duty as a waterproof sleeping bag stuff sack and pillow.