The time around dawn or daybreak, from before sunrise to shortly after; generally around 3–6 a.m.
明け方に鳥のさえずりで目が覚めた。
I woke up to birds chirping at dawn.
明け方は気温が一番低くなることが多い。
Dawn is often when the temperature is at its lowest.
朝のジョギングは明け方に行っています。
I go jogging at dawn in the mornings.