I used to always sleep in late, anywhere between 12pm and 4pm. I had no responsibilities, I was really depressed, and nobody was complaining about it... So that went on until I became healthier and happier. Now that I'm more productive, I get extremely pissed about sleeping late. Too much time is wasted on sleep, I'd rather waste it on work or play.
Nowadays, I'm lucky if I get to even sleep in until 11am. If my child hasn't woken me up, my manfriend will by getting up regularly for morning bathroom time. (I'm a really light sleeper, but even more so when the sun's coming up. It's saddening.) Or I'll end up getting myself up because it's routine now for me to be up earlier than I'm used to. In the end, I'm most likely to be in an unpleasant mood. Shove a cup in my hand that's filled with either a fresh caramel flavored coffee drink, or fresh blood from one of my enemies. Else, I'll be a jerk until lunchtime. You can turn me into a person who wakes up in the mornings, but that doesn't mean I'll like it. :P By the time my kid's old enough for school that starts at fucking sunrise, he's going to be afraid to get me out of bed every morning. LOL