She says, ``I've never felt more creative and with more energy but on the tiniest amount of sleep. I never knew I needed that little sleep. I always had eight hours and now it's, 'Wow, OK, you can function on just four'. But Jackson is great. I've always been very aware of balance and, even before I had a child, my life always takes priority to my work.``
Charlize Theron: ``I never knew I needed that little sleep''