You guys may laugh, but I've gotten into a habit at home of sleeping holding a pillow ( it keeps my hands out of the way and from me cutting off circulation to them in my sleep ).. The one I use at home is shaped like a 18" long tootsie roll. I guess I'm regressing to childhood and need my teddy bear
Long story short, on my last hang on the 2nd night I stuffed 2 pair of thick wool socks in a small compression bag and used that as a sub ( it was roughly half the size of the pillow I use at home ). What I found out was that the wool stuffed bag made a great little device to either hold, or to use at times to stuff in cold spots that developed as I moved around.
It was so handy I had actually thought of getting some poly to make a little 12"-18" tube to keep in the hammock for just that purpose. In the winter it can be a draft tube/cold spot warmer, and in warm weather it can be my faux teddybear. I'll make it out of ACU camo so it will at least look manly.