Anne,
ours was one of a series of burglaries in which the burglars were believed to have used some sort of spray that caused the victims to sleep....a sleep spray so to speak....
everyone reported the same thing....that they slept late that morning....that they woke up extremely groggy and had difficulty getting out of bed and concentrating....
that's also what happened to me even though normally i wake up quickly and easily....
on the other hand, we're pretty sure that my daughter did wake up when they were in the house....
she heard noise from our room and thought we were awake so she came to our room.....but we were asleep so she went back to bed (normally i wake the moment she walks to the door of our room)......
we think that the noise she heard was the burglars in the walk in closet with the door closed...
that thought especially upsets me...to think that she was awake with them in the house....and with us so totally asleep.....probably drugged....so we would have slept through anything that might have happened to her....but fortunately, nothing happened....
anyway....from that day forwards, our alarm has been on....at night when we sleep and any time we're away from the house, day and night....
we also put in a few other security devices at that time (as did all of our neighbors)...plus we got a dog.....a great addition to our family (and i doubt she'd hurt a flee, but her bark's enough to give you a coronary...)