Here's how a simple yawn can be your secret weapon to tackle a tough day

Some experts suggest intentionally inducing yawns to sharpen mental clarity and focus.

Bernard O'Shea. Photograph Moya Nolan

I stared at the computer screen and thought, "Not today". 

It was one of those days where the sight of a lunchbox or even the thought of boiling a potato made me feel physically ill. I just wanted to do nothing except watch history documentaries on YouTube and drink tea. But as my granny used to say to me when I didn't want to do something, "You might as well be fighting the tide".