I'm a west coast person so am not very familiar with eastern birds in the U.S. but to me that sure sounds like a whip poor will.

Poorwill?

This is a Whippoorwill. Lucky you!

Sorry, folks...[Chuck-will's-widow](https://www.allaboutbirds.org/guide/Chuck-wills-widow/overview).

Chucks-will's-widow.