Why doesn't Lucas have a regular frame bed?

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I know this is a no-no at some of our friends' houses, but allowing Lucas to jump up and down on his bed provides lots of entertainment for participant and spectator alike. Plus, it's a good way to use up boundless amounts of energy.

On Sunday he jumped up and down just like this for a good 30 minutes straight. People wonder why he doesn't have a bed frame, well, this is good enough reason as any.