I too put in a lot of miles and ride nearly every day. As a result, my sleep patterns have been disrupted. Most days I'm up between 3:30 and 4:30 am (not by choice). It hasn't been a big problem since I can't seem to stay awake past 9 pm. I haven't yet hit the afternoon "napping" phase, and I don't want to. When I was in kindergarten they made us take naps. It was horrible, and ever since I've always hated naps.