Triple T's: The Tired Thirties

I recently read that most women consider their thirties the decade in which they would best describe themselves as TIRED. I always feel tired. I would need to drink 10 cups of coffee per day to not feel tired.
In the past most people would have called me energetic; often to the point of being hyper. I don't know whether to blame it on the children or my age, but now hyper is out of my repertoire.
I hate being tired- so much so that I banned it from my spoken vocabulary for a time. In the end I had to suspend the banishment because there was just no other word to use.
I used to have dreams of raising children with instructive, educational games and organized home based lessons in a second language. Now I am just happy if the food gets on the table 3 times a day.
I have the mother's guilt that there is never enough time to spend with my kids. And I have spent most of the past 5 years at home. It's never enough. I rarely feel like I have the time to enjoy them and that is something I regret but I just don't have the energy for it.