What Maillotpois says is right on! I trained hard last year as I was doing the AIDS ride and wanted to be in good shape. BUT, I was tired most of the time and my personal life suffered.

This past fall I decided to cut back my AM rides, do more gym work and ride with my club 2 times a week. It's been much more fun and rewarding. AND, I generally do a metric when I'm out, so I feel I've gotten a good ride in. As the mornings get lighter, I'll probably do some morning rides as well (riding at 5AM by myself in the dark aint much fun) just to be outside and enjoy the sunrise and the quiet of the day.

I just did a century in Death Valley this past weekend. I'm tired from the exertion (I did a lot of climbing), but it gave me an gauge as to what I need to work on for the rest of the season. Now, once I have fully rested, I'll be ready to train harder.

My advice- if it stops being fun or at least a joy to be outside on your bike, it's time to cut back.