Meaning: This sentence describes the effect of birds singing in the morning on people who live nearby. It's like saying,
Choice of Words: "Chirps" is the sound made by birds. "Wake" means to cause someone to stop sleeping. "Sleepy" means feeling the need to sleep. "Neighbors" are people who live near each other. When you put it together, it means the sound of birds singing in the morning causes people who live nearby to wake up.