+1 on hanging the head end lower. Below is a pic of my very first overnight hang. Probably my most comfortable so far. I set up at 11PM, tired, and frustrated about finding the perfect trees. I threw the hammock up pretty quick and had the head end WAY lower than the foot end - as you can see on a bit of a hill! I slept for almost 10hrs!
I also sleep well towards the end. The footbox material basically just hangs there loose and covers my feet.