I raise a lot of roosters...
Usually they stop crowing at dusk and don't start up again.. sometimes until 2:30 or 4:30 am.
But yes they can crow at many things... passing head lights, visiting predators, rats, the wind, a car starting, the kitchen drawer closing...
Do you have the lights turned off at night?
It also doesn't bug me... but I have regular conversations with my neighbors to see how they are fairing. Maybe you can chat with them and ask? So far NONE of my neighbors have had an actual issue, even though some were concerned when I first started keeping roosters.
It isn't a good choice for me... but you could try a non crow collar, put on after roost and removed for day time? I personally dispatch any problem birds... and sometimes excessive crowing is a good reason.
It may not bother you... but I wonder if it effect other flock members?
He *may* grow out of it, given time?
Good luck!