Why birds chirp a the middle of the night is a more challenging question. One popular theory among ornithologists is that most species that chirp at night do so for territorial reasons. This seems to be particularly true of mockingbirds.
We can hear birds singing at night at around 2 AM in trees adjacent to the house in mid-December. The main purpose of singing is to attract a mate and defend a territory. Robins are one of the few birds that hold a territory throughout the winter so continue to sing when the majority of other birds have stopped.
Most birds chirp during daylight hours and sleep at night. However, it's not uncommon to hear a bird chirp in the middle of the night. Nightingales are often thought of when a bird sings at night, but the bird you hear chirping after dark may be a mockingbird, a whip-poor-will or an owl.
Bird chirping at night. It is clearly to do with territory, the light might make them think that it is daytime and they then feel inclined to defend their territory for other birds.
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