Are Japanese Shiki-futons comfortable?

Posted under futons

Hello!
I've been wanting to get a Shiki-futon for a long time! They save a lot of space! But I haven't ever tried sleeping on one. Does anybody have one? Are they nice? Do you find it alright to just use it on the floor or do you need extra things underneath?
Thank you for any help!
The wooden frame for a futon was developed after the 2nd World War as the occupying American forces wanted to take them home as souvenirs, but didn't want to sleep on the floor like the Japanese did. I would say, as I have one as an 'occasional bed' that it's fine to sleep on the floor, and no, you shouldn't need anything extra if your floor isn't too cold.

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• shiki futon ikea