You also hired somebody from Sleeping Beauties Watchmen?
Well, I don't have any idea where to buy one of those clocks. But I have semi-related anecdote:
Years ago, when I was still living with my parents, my dad hired a night watchman for our house. Of course the guy slept the night away, even more, he snored, loudly! Anyway, late at night my father, or brother, would arrive late at night and find him sound asleep, and little bastids that they are, proceed to hide his machete, or his torch, sometimes his shoes. This goes on for months.
One night my dad comes back after having installed a car alarm (they weren't very common in those days). He arrives, and as customary, the guy is snoring and drooling on the side of his mouth. Dad gets in the house and hides and activates the alarm.
Peeeeeeeeeeeee!
The guy awakes like hit by a lightning bolt. The alarm is off again and he can't quite understand what happens, but the guy is not disconcerted enough not to go back to sleep 30 seconds later. My dad repeats the dose and the guys wakes up again. They kept doing this for a few minutes until dad got tired and went to bed.
Next morning he calls him.
"Bonjo, did you know I just installed a clock with an alarm that beeps every time you fall asleep. It didn't record you to be awake for long last night".
"Well, Don Rafael, I've decided that I cannot longer work here. I am going back to my campo to grow onions".
Too bad the country was in the middle of one of its worse draughts in decades and growing onions had been banned.