[kljhgfvgbn]

Yes evacuation on take off and landing is very important.

However the regs don't differentiate about the stage of the flight, even if you were only allowed to use the bed during cruise, at 30,000 over the ocean - the same time applies.

[jrockway]

Dunno, this has also been useful. Imagine a scenario like UAL811:

http://en.wikipedia.org/wiki/United_Airlines_Flight_811

You are downstairs in your bed, when the cabin depressurizes and you can't move around. The depressurization also damages the flight controls, making a clean landing unlikely. The unclean landing occurs, the plane catches on fire, and you burn to death in your bed because "regulations are silly".