He go for up to four hours of activity at night. He walks across the room at times carrying large items. My wife ruled out extend bath time swimming and most of the internet searches lead to ideas for infants or old children for which trampolines (also ruled out) are the top idea. He doesn't have shoes so outdoors is out.
I tried getting him to repeated climb on to the bed worked for a while but it is hard to find an item to attract unto the bed without him just reaching over to get it. Any suitable ideas?

I didn't find the right solution from the internet.

References:
http://www.mothering.com/forum/31-life-old.html

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