If I were dming, I'd let it fly, but, your bodies go comatose right there... on the Astral... with all sorts of baddies just LOOKING for a free meal. Astral Dreadnought anyone?

Also, to the debate about where the Astral is coterminous to, the DMG in the planes section mentions that the Astral Plane touches EVERYWHERE. If it didn't, you couldn't plane shift certain places (ie. if it didn't touch the Inner Planes, you couldn't plane shift there, since all teleportation spells use the Astral as a conduit or catalyst for the spell to function. If the Astral doesn't go to the destination, neither do you).

-argus