12:30am my husband & I awoke from a dead sleep to not a little chirp but a full on beep, beep, beep crescendo (too nice a word) and couldn't figure out which of the 6 smoke alarms was causing all the others to erupt. It was the one in the living room was the ring leader & is on our only 16 foot elevated ceiling. BTW, why did the electrician put it on the ceiling & not the wall? Anyway, in his underwear, on the first rung of the ladder with me holding it, my 6'5" husband yanked it off the ceiling. We had to replace it the next day but wish we had known about the nest. They have an evil plan and wait til we are asleep to initiate it.