Huh, 5am, lucky begger. Mine had me up at 3 yesterday morning. She'd managed to get shut in and made sure I knew about it and let her out.
Every evening the cats and I play hide and seek. I stop them from coming upstairs at night otherwise they keep waking me up but they don't like having to 'go to bed'. So about 9pm they suddenly disappear and I have to hunt them out under beds, in cupboards, wherever they think I won't find them.