Pop star Christina Aguilera is struggling to strike a balance between career and motherhood as she had to rework her entire schedule around her baby.

The 'Dirrty' singer, who has a 21-month-old son Max with her music executive husband Jordan Bratman, prefers working in the wee hours of the morning, reported Contactmusic.

"When the sun goes down my whole body starts to come alive, although I am a little different now because I do have a child and my hours have been turned upside down for him," she said.

The 28-year-old mother has had to change her sleeeping routine and re-schedule it according to her son's comforts.

"I'm still naturally a night owl. If it were up to me my favourite time to work would be between three to four am, which is what it used to be before my baby was born," said Aguilera.

"Now I'm a mother, I am getting up earlier. It's 6am every day but I'm a night owl regardless, which means that, for me, going to bed early means trying to get to sleep by 12.30 am," she added.