Start it at night when his bedroom light goes off for him to sleep. Let it go for approximately 30 seconds after his light turns on so he gets up to check then cut it off. Repeat until you’re tired enough that’s it’s no longer worth the joy.
I feel like this might violate the Geneva convention
It isn’t written down or agreed to by UN member states, so it’s a-ok to do here
Canadian rule of the Geneva convention: It’s not a war crime the first time!
If it’s not a war but just a special pettiness operation, the Geneva conventions don’t hold.
I’d use the sound of a cricket or some kind of insect. Make him paranoid and spend all his time hunting for imaginary bug
3 seconds of mosquitoes buzz, like it just swooped near. That’d do it for me.
If you’re monitoring his movements, I’d go with a dripping tap sound. Just silence it every time he gets out of bed
I must say, playlist on shuffle of 1-30 minutes of silence and one single chirp seems equally devious while also not requiring you to stay up. Loop the playlist over the course of an hour, let the shuffle adjust how long between chirps each one is