dawn, early morning (before sunrise)
Duvido que ela esteja acordada a essa hora da madrugada.
I doubt she's awake at this hour of the morning.
A temperatura deve cair bastante durante a madrugada.
The temperature is expected to drop significantly during the early morning hours.
Nos levantamos às quatro da madrugada.
We got up at four in the morning.
A gente passava lá toda madrugada.
We used to go there every early morning.
— Cidade dos Homens (2007)
O pessoal do condomínio reclamou do barulho na madrugada.
The residents of the building complained about the noise in the early morning hours.
Nós conversamos até as duas da madrugada.
We talked until two in the morning.