I'm awake, don't know why.
Do you ever wake up very alert and uneasy? I've had to check my children are all safe in their beds.
As this is AIBU I'll phrase this as AIBU to think you can know instinctively something bad has happened?
Alternatively why is my brain waking me up when every other fucker is asleep and I've had disrupted sleep (due to children) all week!