This is very true of a lot of people with Ataxia. I know I, myself, have to plan out my day accordingly. If there is something that I really want to do in the evening then I will take a nap in the afternoon in preparation. When I’m tired, everything seems to attempt to ‘shut down’. My walking gets worse, my speech more garbled…Heaven forbid I need to write my name on something! I’ve recently decided that I will no longer drive after dark.