it does not sound like a meltdown,as someone in a meltdown state is not going to be able to be that quiet and think that well,it sounds like were avoiding something do not want,and chose to do it,whereas if were in a meltdown then,would not be able to have that sort of freedom.
meltdowns are sharp-obvious to others-outbursts because the body cannot cope-the autist has no control over it,meltdowns are more physical outburst related-or might be very strong verbally,eg,headbanging on something and punching and kicking self is an example of the physical type,whilst screaming/shouting is an example often given of the verbal type.
it is more possible had a shutdown under the bed,as shutdowns are inner attacking, the body cannot cope so instead of going into fight mode,decides to shut off to all outside input instead.
have a read of this and see if it sounds like what have/have had:
http://everything2.com/index.pl?node_id=1707940am used to get under the bed to,to hide from certain staff,for pressure and sensory reasons,but then they replaced the bed with a solid divan one and drilled it to the wall so cannot be go under,only mattress can.
Thank you for that link. That's very interesting.
Some of the things that people experience during shutdown are exactly like what I experience during a simple or complex partial seizure.