Lately, my energy for writing doesn't match my enthusiam. I still have the desire and determination, but when I have the time, I'm too tired to get into that mental writing space. I know people say that if you want it badly enough, you'll make the time, but that isn't always true. Sometimes, even when you have that small block of time (e.g. the time you wasted watching "The Bachlorette"), fatigue takes over.
I think I'd rather have ten minutes of clear-headed, productive writing time than an hour of the scrambled, stilted or trite stuff that comes out when I'm too tired (which might end up being less than ten minutes worth when I edit it down).
What works best for you...pushing through so you know you'll at least have accomplished something, or waiting until you know you will have a good writing session?