How or what to practice when mentally exhausted? You had a long day and your batteries are drained. You would like to improve your chess though. How to do this in an appropriate or maybe even restorative way? Should you practice at all or do something else instead? 

I found myself blundering away in games or tactical puzzles and moved away from it to look for better ways. How or what do you guys practice if your mentally exhausted? 

Edit: Thank you for your answers!
Yoga.

Failing that watch your favourite TV programme.