:) *hugs* hope you either yanked the battery out and got some sleep or it shut up. my brain went to london with my husband and the rest of me is still in brooklyn. i'm averaging 2-3 hours of sleep and waking up at 3am. awake awake. without caffiene (until later in the day)
I hope you figured out what it was!
Must be time for a new battery. DH and I rented a cabin in the mountains back in May and a dying battery in a fire alarm greeted us. After 2 hours of waiting on the maintenance people (the alarms were way up on the ceiling), we found a ladder and bought some new ones. That sound will drive ya nuts!
LOL... It sounds like a UPS to me. Do you have your computer or electronic gear plugged into one?