"Only" riding the bike 5 days a week?
That made me chuckle as well! How many days do you have in your week?! I think 5 days is quite a bit actually. You do enough to make you tired, your body needs to rest!

But, I know how it is to want to be doing something all of the time, soooo, how is your iron level? I have been really tired at times this week. I didn't do my indoor training on Monday and still I have been really tired. Had my iron level checked and I am pretty low. So upping my iron, by eating more cereal and back on my multivitamin to see how that works with my energy level. I know when I don't eat cereal in the mornings my iron levels drop quite a bit.

Just a thought to consider! Hope you get back to riding, uhm, 7 days a week!