a mattress

i just used some jackets

your body

just a table cloth LoL

My girlfriend once. Also a coat before.

Unfortunately I have had to sleep without anything before

I use it a lot, especially in the field of military, quicker and easier than a blanket to get mobile.

my gf

a sheet

a man

i used carpet

a towel

covered with leaves ... and a piece of plastic

I used leaves and plastic as a survival method

leaves for insulation.. plastic to keep out the wind and water

a dog

a pillow

I used to put hands to each other and push between legs to become warmer and sleep

i use my feelings of lonliness

So we just lied with our spines towards each other and like heat each others backs

So my answer to your question is a friend with a warm spine