Kizar_Sozay

For the past week, at 0347 a car's horn has been going off in my neighborhood, waking me up. Last night I got up and looked. The horn was going off as usual but all else was quiet.
This morning I honked my horn and it sounded familiar, like the 0347 horn. When I went out to look in the dark of night I heard a horn but my Accord EX was not blinking any lights or otherwise looking unusual.
I think I am the guy I have been cursing out every night for a week. Any ideas what could be causing this at the same time every night?