Perhaps sounds of combat, emergency vehicles around the hospital and heavy equipment removing rubble?
both scenarios possible. but still..."sleeping" under those circumstances ? if they WERE patients immobilized by injuries, that is one thing. anything else, i'd expect heads popping out to see WTF is going on. not like a tent is any cover...Or since most hospitals in Gaza have been disabled or bombed to shit by the IDF the tents were set up for patient overflow.