
NEMO
Disco 15 Series
Spacious for side sleepers; bulky, temp rating optimistic.

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If you get two of the same sleeping bag then you can zip them together, my wife and I did this for years. If you can find a used Nemo Tango Duo quilt system then that's pretty sweet. We have used one many times and it's a good system. They don't make it anymore though, so eBay is your best bet.
I’ve been backpacking with my Nemo 30 for about 4 years and I LOVE it. I’m a side sleeper and I toss and turn a lot and I find that it gives me (5’ 0”) plenty of room to move around without getting cold. On warmer nights, I just open the zip and get enough airflow to not overheat. It’s lightweight and packs down super well with the provided compressive bag. Generally speaking, I run warm, and have comfortably used this bag in temps well into the low 30s with wool base layers and not felt cold
The older I get the thicker the sleeping pad... Where I live, I need 3 distinct sleeping bags - warm weather (Big Agnes), shoulder seasons/early winter (Nemo), and extreme winter (Big Agnes - takes up the whole backpack!) I have an REI half dome tent - big enough for weekend camping, small enough that I could backpack with it if I'm not using a hammock. I also have several Coleman Sun Domes as lenders, and my boys each have a Kelty when they don't hammock. For front country camping, a nice comfy camp chair is worth its weight... consider a lightweight backpacking chair as an addition or alternative. You can enjoy a lightweight camping chair in camp, but hard to take an XXL rocking camp chair backpacking... Consider hammocking, too, but that's a whole additional rabbit hole to travel down.
This. I hate mummy bags. I move too much in my sleep. My Nemo takes up a bit more space in my pack but it is so comfortable and a good night’s sleep, where I can fully roll around in my bag, is worth it. I will never go back to a mummy bag.
It might depend on how you're built, but I can get my leg up like that inside my Nemo bag. I have short legs, though.
I really wanted to love the Nemo, but if OP is a smaller person, Id warn they have too much dead space.

NEMO
Disco 15 Series
Spacious for side sleepers; bulky, temp rating optimistic.
Hammock Gear
Classic Burrow 20°F
Budget king; very warm but heavier than ultralight.

NEMO
Disco 30
Spoon shape for side sleepers; prone to zipper issues.

Western Mountaineering
VersaLite
Durable, very warm; premium price, too hot in summer.

Katabatic Gear
Alsek 22°F Quilt
Versatile 3-season quilt; secure pad attachment, high price.

Ranked #1
NEMO - Disco 15 Series

Ranked #1
Kelty - Tru.Comfort Doublewide 20
Ranked #1
Enlightened Equipment - Revelation APEX

Ranked #1
NEMO - Disco 15 Series

Ranked #1
Feathered Friends - Egret UL 20/30

Ranked #1
NEMO - Disco 15 Series