Dude. I posted a crazy great deal on the thermarest neoair just a few weeks ago. They were 50% off.

The 2 best on the market (in my opinion anyway) are the neoair x-therm and neoair x-lite. Both made by thermarest.

If you have an old self inflating thermarest you’ll find the neoair to be incredible. It’s a huge comfort leap forward.

The x-therm is a little heavier but is more durable and has a higher insulation value. I have 4 x-therms for me and the family. Expensive but totally worth it.

Thanks Eddy and JDB - How compact do they get when you pack them up?

From what I hear, Thermarest is the way to go. I own a couple Klymit Static V and I'm perfectly happy with them. Much more budget friendly, extremely compact and lightweight, and I personally find it really comfy. It doesn't have the best R value compared to more expensive options, but I've used it as low as -1 degree celcius with a good winter sleeping bag and had no issues. If you're looking for budget, I'd highly recommend it; if you're looking for the best, probably worth sticking with Thermarest.

I’ve just bought a sea to summit insulated thermolite, 6.3 cm when inflated, R value 4.2  at half price ( thanks for the link jdbonney) we camp only in shoulder season, but I’m a warm sleeper, so Rvalue wasn’t much of a concern for me. Our  thermarests are 20+ years old, and still in great shape, self inflatable which I love. I’m a died in the wool thermarest user, but find the oldies bulky, weight wasn’t much of an issue. Nowadays Though I need shoulder and hip support, the thermarest mondo king is fantastic for that but not for long canoe trips and moving lots, far to bulky.
I don’t care for the thermarest neoair mattress, it makes crinkly noises when you move around on it, which bother me.
So far the sea to summit inflates easily with a few breaths, and my hips and shoulders stay off the ground, giving me a comfortable sleep. And no bothersome crinkley noises. I’ve no experience with sea to summit at all, so we’ll see how this lasts. Having a large frame and being 6’tall, this mattress (L] is wide enough so I don’t roll off and so far suits me to a T. And the very small packing size is a very big plus!

https://www.cleverhiker.com/best-sleeping-pads

https://www.outdoorgearlab.com/topics/camping-and-hiking/best-sleeping-pad

https://www.switchbacktravel.com/best-backpacking-sleeping-pads

The neoair is very highly recommended. The only downside generally sited is cost. It’s pricey. I’ve managed to get all of
Mine on sale at least 25% off.

With 4 of them in our tent we still sleep soundly. Yes they make noise, but no it won’t ruin your sleep. I guess that would depend on how soundly you sleep. I noticed it the first time I got it and thought I would have to take it back. First night sleeping on it and I never thought about it again.

They crinkle like crazy but it does settle/quiet down over time (Plus you get used to it). I cut my Thermarest X-Therm Max down a bit. Took 6" off the length. It is a multi layered material with the inside being sort of like a mylar space blanket. That is what makes the crinkly noise. Doesn't bother me at all any more. 

Scissors and a household iron. It just melts the nylon back together. Mine has held fine for a couple of years.