Backseat tent / Car fort

At night in my car, my hands get cold and stiff when using the laptop. To solve this problem, I've set up a tent that keeps the backseat area warm.

Just a thin bed sheet will raise the temperature from 36 F to around 50 F. Insulation doesn't need to be heavy, it just needs to trap warm air from escaping.

I lashed a hammock hanging strap between the handles above the rear doors to hold the bed sheet up. Then I put a poster board over the strap to create a roof. The bed sheet hangs tucks behind the rear head rests and hangs off the poster board.

Kinda stuffy to breathe underneath the tent, but my fingers stay nimble.