Grumpy and Tired

I feel very grumpy and tired this week. I am not sure why. I have been sleeping OK and there are no obvious problems occurring. It's very strange. At least it's nearly the weekend - that should help! I've got to plan the 1/2 hour slot of wacky games we do each month at a kids club. I have in mind things involving doughnuts, hard disk magnets and the ever present water bomb balloons and shaving foam...