Mattress, Futon, Sofa - What do you sleep on?

My wife and I sleep on a mattress. But, when we go to my mother in law, I sleep there on a sofa, or sometimes we take by ourselves a futon and sleep on this one. Once my mother in law's sister lent us an air mattress, and I tried to sleep on this... In 30 minutes I returned on the sofa! I find it uncomfortable and it makes me sea-sick. By the way I could have sleep also on a carpet.

i sleep on a mattress bed. But since im sleeping in my parents room because it is air conditioned, I sleep on the floor. hahahaha.. :)) oh well, that's life!

I sleep on a mattress. I've tried to sleep on a sofa once, but it was very uncomfortable, and I kept on waking up all night.

i sleep on a matrress my friend before that i was sleeping on sofa only, so i m feeling quite good as compared to the past experience.