Exercising in the afternoon or evening has its pros too. You don't have to wake up early and miss out on sleep, and your body has a chance to warm up throughout your day, so when you exercise, there's less risk of injury. It can also be cooler at night, which is great during the Summer months.
Since there are pros and cons to each, the bottom line is that it doesn't matter when you exercise, as long as you do it. So what about you . . .