My roosters start crowing and by proxy my hens start stirring between 2am and 3am just waiting for enough light to get going for the day and honestly it's perfectly normal for chickens to be awake and ready to go 2-3 hours before sunrise... Same with many wild birds in my area, about 3am the songs start coming from the trees...
Song birds are ok during the early morning but my DD has Mocking Birds that twitter loudly in the trees all night long all through the night every day of the week that I never get any sleep at her house. I'll take my quiet chickens over any song bird any day of the week !
Since I normally go to bed between 3am and 5am those morning song birds can be highly annoying if the windows are open and they decide to perch on the gutter, roof or in a tree right next to the window... My birds make a lot of noise, but between being contained in a building and the lack of windows facing the house you can barely hear them inside the house most of the time...