On Tue, 25 Oct 2011 05:11:23 -0700 (PDT), "
wrote:

Did you have air loss where it would repressurise during the night. I
had a friend in the hospital and her bed would pump itself up every 10
minutes or so.

That's not what you think it is... It does that 10-minute cycle
deliberately, and the mattress pad has two different zones kinda like
two cheap I-beam beach mattresses put together out of phase. ABABAB

It's to avoid (and/or heal) bed-sores in people who have poor
peripheral circulation and can't move at all, from either paralysis or
sedation - the mattress pad does the periodic moving and shifting FOR
them.

-- Bruce --