Many of the cyclists that I know, regardless of whether they are road cyclists, mountain bikers, commuters, fitness-freaks, triathletes or whatever - do a lot of their riding in the morning. They crawl out of bed at sparrow-fart, ride into the sunrise and then head home for a shower and feed before going to work.
I've thought about doing that lately, but just can't get my head around it. After 4 years of commuting to work by bike, if I get on my bike at dawn, my head is hardwired to ride into the city and nowhere else. I can't get used to the idea of going for a ride at say 6am, and coming home an hour or two later. If I leave home at that time, my next place of call should be the office, not home again. It's actually turning into quite a psychological block.
On top of that, most nights consist of broken sleep thanks to two young kids. One needs feeding several times a night, and the other usually crawls into our bed somewhere between 2am and 5am, and spends the rest of the night fighting me for my pillow or asking for a refill of his bottle.
So I do all my riding in the middle of the day, or late afternoon. The mornings are just not for me.