+1 This isn't a question about bike commuting, this is a question about insomnia. Thank bike commuting for flushing the problem out and magnifying it. Being in the health profession and having suffered from insomnia myself, I can tell you SLEEP is the important thing here and the necessary priority that all things are affected by. I too have a deep philosophy of not taking prescription meds, but if all natural remedies have failed, it becomes more important to take meds and SLEEP rather than upholding your philosophy and having insomnia.

Eventually you will not function at your job whether you bike to work or take a helicopter, it doesn't matter. You are stressing out your adrenal glands to the point of chronic fatigue. Agreed with chipcom. See a sleep specialist. In the meantime (when you get home) do not fight afternoon naps or just going to bed early evening if you feel exhausted. I missed the NCAA finals and couldn't care less because I was whupped. I cycled 50 miles (commute to work + errands, etc) and trained with a really hard upper body workout in the gym. If you get home and you feel tired - listen to your body and SLEEP then. So what if you wake up early. Worry about sleep rhythms later.