Q-Core SLX Insulated

Exped Ultra all the way. I have the 5R, mummy, and it is perfect for a side (and rotisserie) sleeper. (I do not find the mummy shape a barrier to comfort and it’s a lot lighter than the rectangular model.) Big Agnes’s Rapide is also very comfortable — I have the Q-Core SLX, the Rapide’s predecessor — but it’s true that it feels colder than the R-value would suggest. The Exped in my experience feels accurately rated.  I use my little foam sit pad as a knee pillow, and be sure you have a high enough pillow, too. I slept comfortably this way for three months on my Southern Alps traverse. 

I have a big agnes q core slx that I paired with a diamond park bag from them. Granted both have been discontinued, but at 6'4 and around 315lbs as a side sleeper I had very little pain (hips and shoulders would occasionally touch the ground). Would see what BA has for current pads and find something similar size wise

We use an Agnes XL and love the Agnes mats. Super comfy. We also put a foam pad under it and use a sheet to keep it all together. The sheets are king sized and wrap around and under. We also do the matching sleeping bags and sometimes connect them together and other times we do not. My wife has a cot but anymore she leaves it at home and sleeps on the pads with me. Also....it helped us a lot when we got a bigger tent. I know you are talking one night and all ...but getting a bigger tent we could stand in and have a little floor space with rugs to walk on makes things much more cozy for us. Takes a little longer for setup and takedown ...but worth it for us.

I’ve had a big Agnes q core SLT (like green) r value around 4. It was amazing. Lasted two seasons, then started a slow leak that was not able to find. I ended up throwing it out but 10/10 would buy again. I’m a side sleeper/stomach sleeper and it was perfect for me. 5’8 200lb

Big Agnes Q-core, they make a wide / long one with a Decent R- value that still rolls up to about the size of a Nalgene. About 3 - 4 inches thick I believe.