If you are looking for an extremely (yup - extremely) comfortable sleep, and want something that is light and compact to carry and very easy to set up and take down, I don't think you can beat a Hennessey Hammock.
I spent 10 days in one (with the cold weather attachment in Northern ontario this fall moose hunting and I have NEVER had a better sleep in the outdoors. During those 10 days we had everything: wind, rain, below freezing and snow (and even some nice warm weather).
I strung a tarp over one end so I had some shelter to store my gear and get dressed in and it worked very well.
I really need to emphasize how comfortable that hammock is. It is better than most beds I've slept in, let alone camping in the bush.