unusual culture

when i went to Korea, I stayed my firend's house for 2 days.
What I was surprised the most is the way they sleep.
we sleep in bed or futon but they sleep on a blanket with thin blanket.
it was not soft at all so I couldn't sleep well.
I dont know how they sleep in winter, but i prefer Japanese way to Korean way.
if this culture came to Japan, I think it would a little better than Korea because we have tatami in Japan so it would be more soft and warm.
but I would like to sleep in bed or futon which are soft and warm...