Dear Brain,

[yrieithydd]

It is considered conventional for you to switch of for 6-8 hours in a 24-hr period, so why did you keep running on full for 23 consecutive hours yesterday even I spent 3 hours lying in a dark room trying various of the usual tricks which persuades you to switch off. It took a further two hours of work/spod before my body was exhausted to the point of tears for you to get the message. Now slightly over two hours later you've decided to switch on again. I know the phone rang and that I need to get work done but ...

Self