Car camping sleep options (for couple)

I use a wool topper on the air mattress. As we know from our camp mats that R factor underneath is important and this topper adds a lot of breathable warmth. Air beds don't have baffles so if you don't do this they are cold for me. We use a sheet set and pillows from home then top it with a nice comforter unless it is very cold. Sleeping bags are last defense. Very bulky set up but very comfy.

First I have a van so I can fit stuff like this but I also bring when we family camp:

www.amazon.com/gp/product/B07218B4DQ/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&th=1

and

www.amazon.com/gp/product/B07T48QNXS/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1

The most cozy and comfortable sleeping bag from my youth and early car camping days was an LLBean cotton flannel lined rectangular "camp" bag. The size of a small child when rolled up. I remember one from North Face too, but I don't think flannel on the inside. I think most of them zip together as long as you get two of the same kind.

This is just me but an air mattress, topper, sheets and a comforter would be too many parts for camping. I would get one of the high R-value basecamp mats (usually in the 6-9 range) that has real side-walls so that it's like a mattress. I have an Exped one that I truly love. People do rave about the Megamat Duo. Add two rectangular bags that have a nice lining fabric that can be zipped together or used separately.

Btw, I've never found cots to be more comfortable for sleeping.  They're even colder than a conventional air mattress, so you'll need an insulating pad as well.  Even in summer, I've always found them to be way too hard (firm) without a pad.  What cots are good for, imo, is that it gets you off the floor.  Much easier to get in/out and keeps your bedding cleaner and dryer.  You also have a nice place to store your stuff underneath and a place to sit.  Just wanted to point this out if your goal is for "better sleep".

Something like a bottom sheet is nice—if not a flannel-lined bag, then a flannel bottom sheet. I have a fitted sheet for my car-camping Nemo pad, and in warm weather I use a top sheet, with or without my quilt. In colder conditions, I still use the bottom sheet but skip the top one so I can use the quilt in snugged-up mode. I carry different pads and tent for the car vs. Backpacking, but use the same quilts. On a long trip in varying conditions, as we when I went to the GC in April, I take both my 10-deg and 20-deg quilts, and the sheet, which allows for various configurations to be comfy from nights in the 60s on down. Way down, since I can layer up the two quilts.

ETA: comfy for 60s on down because any warmer than 70 and there’s no such thing as comfy.

Let me just say first of all that I have never seen a double cot, and I can't imagine that it would be comfortable, since a cot is really just a sling on legs.

My feeling is you probably want to be looking at a Queen size mattress and quilt setup. The older I get, the less I feel like sleeping bags are a good design, since the insulation on the bottom really does nothing once it's compressed under your body weight, so why invest in it? Since this will be for car camping, you don't really need to worry about weight, so you can go for less expensive gear, and save your money for the real backpacking gear that needs to be light and small.

And while my ex and I did somehow manage to sleep together on a Full size mattress in our 20s, that wasn't by choice, but out of poverty. As soon as we could afford to, we got a Queen size bed.

While I don’t have their mattress I do have a few other of their products snd I like them. 

lunolife.com/collections/shop-air-mattresses

I'm used to you walking into the campsite with your backpack as if you'd hiked there. Not sure I'm going to recognize you with a big air mattress that needs a 12V blower.  

A 12V coffee grinder, on the other hand...

www.youtube.com/watch?v=xaUqLqw_aAI

This guy does a few videos, I was (am?) tempted to get an ALPHA Breeze, because of his reviews, love windows and porch, but it would take a long time to setup (solo), and wind might be a problem. He has also gone on to another shelter, but still uses the Alpha. Plus a tarp (I use one too with Double Rainbow) - Porch might not work as he says in windy rain, but it could allow you to keep the window part way open, of course a Tarp would do that and more. Amazing he gets all this stuff in a small car. Former BP, until he had a kid he says on one of the videos.

FeatherFriend makes a double sleeping bag, or you can buy the condor and get a bottom to make it have all the down on top, but still sealed except for head etc.
featheredfriends.com/collections/two-person-sleeping-bags
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Edit2
I don't see a two person bag anymore, I imagine you could zip 2 condors together?

here it is:
featheredfriends.com/collections/sleeping-bags/products/spoonbill-ul-2-person-sleeping-bag
better to click on sleeping bags and scroll through them all then use their options! Condors might be warmer.
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If you want something higher off the ground? I imagine he has done that too.

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EDIT:

If you don't need to snuggle,
featheredfriends.com/collections/sleeping-bags/products/feathered-friends-winter-wren-down-sleeping-bag

Great for freeing your arms, use sleeves or coat.  Not that warm though, should be called summer wren. The idea was for it to be wearable (zip up arm holes while sleeping- but I use coat or sleeves), and I think that could work while sitting, easier to take off for going to restroom?  Double sleeping bag might be better?  Down pants/coat for sitting around-easy on/off, could sleep in them too?