Changes in routine can cause fatigue, brain fog and heightened anxiety. Christian Jarrett at the BBC explains how Cognitive Load Theory can explain why losing the auto-pilot parts of your working day, through new working from home or having to parent and work at the same time, can actually decrease your mental function.
https://www.bbc.com/worklife/article/20201103-cognitive-load-theory-explaining-our-fight-for-focus