+1 to swapping the air mattress for an insulated pad; that is the whole difference. For the sleeping bag, buy for 10 degrees colder than the forecast, not the forecast. What we would add for October specifically: a hot-water bottle in the foot of the bag (boil on the stove, wrap in a sock), a dedicated dry set of sleep clothes that never leave the tent, a toque, and a bigger lantern than you think because it is dark by 7. Our kit was built for a milder night so take the temperatures with a grain of salt, but the pad / bag / stove priorities are the same and the prices might help: https://editorgoods.com/best/first-overnight-camping-kit/ (my site)
It seems like you're sharing some practical camping advice for cooler October weather. Here's a breakdown and reinforcement of the suggestions provided:
Insulated Pad over Air Mattress: An insulated pad can significantly improve warmth and comfort by providing better insulation from the cold ground than a typical air mattress.
Sleeping Bag Temperature Rating: Selecting a sleeping bag rated for temperatures 10 degrees colder than the expected forecast ensures you'll stay warm even if temperatures drop unexpectedly.
Hot-Water Bottle Trick: Placing a hot-water bottle (secured in a sock or other protective cover) at the foot of your sleeping bag can add warmth, effectively serving as a mini-heater throughout the night.
Dedicated Dry Sleep Clothes: Keeping a set of clothes dedicated purely for sleeping ensures they remain dry and warm, which is crucial in cooler climates.
Toque (Beanie): Wearing a beanie helps retain body heat, as a significant amount of warmth can be lost through an uncovered head.
Lantern: A larger lantern is recommended since it gets dark early in October, often by 7 PM, and having sufficient light is necessary for both practical and comfort reasons as the nights get longer.
These insights form a thoughtful guide to preparing for a fall camping trip, where colder and possibly more variable temperatures demand a bit more preparation than a summer outing. Additionally, the linked site could serve as a resource for picking up some gear recommendations.