Going on a mtb trip by myself, which I've done quite a bit. The low Saturday night is around 30-34F, here's my setup:

Gazelle T3 Tent

Air Mattress: Ozark Trail Queen 13" (this is the weak link)

Sleeping Bag: Teton 0 degree Polaris

Layering: I bought a foam pad to put on top of the air mattress for insulation and I'll put a sheet over that to keep it in place. I have a old Coleman 40F sleeping bag I'll layer over that. Then the Teton sleeping bag.

Clothes: Merino Wool tops and bottoms (first layer for snowboarding), sweat pants, hoodie, I have a neck gaiter I can roll up over my ears that's comfortable, wool snowboard socks.

It warms up to the mid-60's during the day, but that low is what has me concerned. I like sleeping cold, but there's a line I don't want to cross being miserable. Thoughts? Should I stop by REI and grab a insulated sleeping pad?