Working 9 - 5.

So, after finally getting a full time job with a salary, I have just finished my first week. AND I'M SO TIRED. I know it'll get easier as I get use to it, and get earlier nights, but still. I don't understand how people with children still have energy to look after them and work a full time job. I'm staying at home and being a house husband when I get round to popping some out.  Or if I have to work, I'll just leave them to it. What's the worst that could happen...? ^_^