Tempo Endless Promise Synthetic Sleeping Bag 35F (Men's)

I have a Nemo Tempo 35 that I use for car camping and sometimes paddling. Super comfortable shape, and l do find its comfort rating of 40f to be in the ballpark. If forecast is for below 40f, I bring a different bag or plan to wear a puffy or fleece.

I have a Nemo in 35 and 20 and backpack in the Rocky mountains. If I had to pick one, I'd buy the 20. I do love the light with 35 when I can get away with it, but I'm often not brave enough to take it, even in the summer.

FWIW I camp 3 seasons in CO at high elevation with a Tempo 35. Have had nights in the mid 20s in fall and still slept great. IMO the 20 would be bulky and hot... but the campfire bourbons definitely helped keep me warm as well 😉

As a warm sleeper I would absolutely die in a 15 degree bag if it's 30+ out. I would have to fully unzip it and then struggle to regulate temperature all night. The Nemo gills help a little but they do not help enough if you're a warm sleeper and it's 15 degrees over your bag rating. I have a Nemo 35 degree bag that I use and I've never been cold in it even though the comfort rating is 40. If it's 50+ degrees out it gets too hot. 35-50 is definitely the sweet spot for it. Personally, as long as you're not in dangerously cold conditions, I'd always go with a warmer bag and wear extra layers to bed or have a backup quilt to throw over it in case it actually gets too cold. I've had way more camping nights ruined from having a bag that's too hot than one that's too cold. You can always add layers but once you have to fully unzip your bag because it's too hot you're in a tricky place with temperature regulation for the night. If you're a hot sleeper do not buy a 15 degree bag if you're basically only camping above 30 degrees. I would be looking at a 35 and then also buying a cheap synthetic camp blanket as an extra layer when needed or an only layer for nights that are 50+

I sleep like you and it’s been the bane of my backpacking experience for the last 40 or so years. A few years ago, my husband bought me a Nemo side sleeper sleeping bag for Christmas. I was a little skeptical, but it actually helps a lot. I can’t remember what it’s rated to. It’s definitely not for extremely cold nights, but I don’t know if there are options in that. For car camping one of the main things I do is carry a wider pad. That way when I pull my knee up into the side, it at least stays on the pad and isn’t on the cold hard ground. As someone else mentioned, I also keep some extra gear in a stuff sack, and use that underneath my knee, which helps for warmth and back comfort.