Definitely not firing on all cylinders

At lunchtime today, I put my lunch in the microwave, nipped off to the loo, came back to the kitchen and realised that my kindle wasn't on the table where I thought I'd put it. I had a horrible moment where it seemed all too plausible that I might have been distracted enough to have put it in the microwave with my lunch, but fortunately it turned out I'd just left it in my office.

Later, I sat back down at my desk after popping along the corridor to speak to someone, took off my mask and tried to put on my computer glasses, only to realise that I was still wearing my seeing-things-other-than-computers glasses and trying to put the computer glasses on top of them.

At that point, I decided it was time to give up and go home.