A number of my spare-time hobbies and pursuits are solo activities. I like to write and build software, and these are things best done alone. Well, actually pair programming has a time and place, and I rather enjoy it at times, but for the stuff I do it's typically all me. I've noticed that I'm best at these things, and at my most productive, in the evening.
It's not hard to see why. Simon is in bed usually a little after 8, and Diana tries to get to bed by 11. At that point, I can devote focus in a way that I can't during the day. Factor in a lack of TV, less crap springing up on the Internet, no day job to get in the way, and you have the machine that is me.
The obvious solution to satisfy my urges in these solo activities (not that kind of solo activity, pervert) is to stay up later. That doesn't work, however, because of the need to get up for work. I also happen to really like my wife and my son, and love spending time with them in waking hours. And dammit, I need my 7.5 hours of sleep.
I need to figure out how to adjust for this. I'm greedy, and I want it all... the good family time, the good leisure time and solid sleep. If I add other things like woodworking or basket weaving, I'm screwed!