Although you've probably already gotten your answer, I'll add my 2-cents'-worth by confirming that - especially this time of year - mockingbirds will sing ALL night long. With this being courting season & with birds staking out their territory, male mockers will continue their serenades the entire night for several days, much to the chagrin of some folks who like to sleep with their windows open during the mild spring nights of the Deep South!

A GA transplant now in Lacey, WA
Jennifer Griffith