Side sleeper and I sleep warm. I bought a EE Revelation 20 degree with a nemo tensor insulated. Took a early season hiking trip with the girlfriend in the alpine lakes area in WA, temps got to down around 35...I was sweating. Granted, it was above the temp rating, but i have read reviews of people being cold in that temps in that range. My only suggestion, get a wide, if you are a bigger guy, get an extra wide.