Brilliant !! Though you will need slightly looser bed sheets

How do you fit a sheet to it? Or wash it? I love the idea, but I can imagine those crevices turning into something I wouldn't want to put my arm in...

The answer to a real problem. Longer bedsheets that fold into any three of the grooves will make it work. Perhaps a mattress overlay that is added on top of the existing plain mattress? Then electric blankets, under-blankets and sheets are all situated under the answer.

I think it should be called a "side-sleeper mattress." Cuddle is cuter, but side-sleeper is already defined as an important market segment which has special pillows, etc. Plus, I'm a side-sleeper all the time and a cuddler only part of the time. It might also be good to offer a version that is a mattress topper which is another defined segment.

AMEN AMEN AMEN--Thank You

How much $$$? A protective mattress cover and 800+ thread sheets will be problematic as it's shown in the video. Making the bed and tucking it into all the slats, it seems, will take a lot of time. Good concept though.

Excellent idea!
I agree with all the others. I too am a 'side-sleeper' and my arthritic right shoulder gives me no end of gyp with an ordinary mattress.
I'm not going to wait for Mr. Motjabavi though - I'll be sleeping on my boat this weekend, so tomorrow I shall purchase some firm, closed-cell foam and make new mattresses for my bunks. :)

I too am a side-sleeper. I typically sleep with my elbow under my pillow and above my head. Seeing something like this makes me want to take a knife to my bed. What a great concept... I'd love to try one out.
Perhaps they could even offer varying "angles" to accommodate a wider range of arm-positioning.

What a nightmare a bottom sheet would turn out to be.

See the video guys. The sheet is a stretchable sheet.