I actually went to bed at 9:30 last night. Which is very early for me but I thought, why not. Well don't ya know I woke up at 2:30 AM? This is the second night in a row. And before you ask, yes, I did go to bed early last night too and had the same thing happen.
I heard chirping. Like a smoke detector that needs a battery change. It is sort of quiet, muffled I guess.
And I don't hear it during the day (yes I did try, stomping and clapping like a crazy person in the area where I hear it, why do you ask?). It stops when I end up falling asleep waiting to hear it.
I need to get that figured out. Because I am not crazy.
And you in the back? Go ahead laugh, it is funny.