I used to be the same way until we had a child and I had to start getting up much earlier. However, when I started bike commuting I had to get up even earlier, and then had to move my wake-up time to 5 am about three years ago when my office relocated and my commute distance increased by 50%. Eventually I got used to the earlier wake-up times, but it was tough at first. On weekends and vacations, I quickly revert to sleeping late but never as late as in the good old days.