Not fatigue as in 'I need sleep' but fatigue as in 'I just can't be bothered anymore' which usually sets in when you hit roadblocks in whatever project you're working on, generally the closer you get to deadlines.
It can be in work projects or personal projects, but it's something I keep hitting more and more lately. I'll get an idea, get into working on it, have a few really good days and make progress, then just some niggly things will trip me up, I can't get things working the way you want, I've hit limitations in the framework, I've got problems I can't find documentation for, etc. and it just gets too frustrating.
Or am I alone in this?