Growing up in NE, I'm not unfamiliar with the sound of the siren. In NE, the siren means "get to the basement NOW," I wasn't sure if it was the same in MI (mostly because their sirens often can't be heard!), but decided the responsible thing was to take the babies to the basement rather than wait and find out!
They were cranky at first (they rarely wake up happy), but quickly settled into the adventure of the situation! They got to sit in their special Winnie the Poo chairs (thanks Lala!!), and watch as much Baby Einstein as they wanted! Good times :) Even more good news...because of all the excitement that night we all slept in the next morning! Yay!