Noon and I'm already exhausted. BUT...that's cuz I've been up non-stop working since 6:00 a.m.!
As I grow older, I'm learning to not slave-drive myself so much and to deliberately take time, even if only 20 minutes, for some re-group/re-energize time, a cup of tea, a kitty snuggle....
The rest of the day is then more productive BECAUSE of that break! :)