Something in the air(con)

I'm convinced there's something dodgy about the aircon here. A good few folk are feeling very dozey lately. I can barely keep my eyes open for much of the day - not at all like me. I actually want to curl up under the desk and sleep.

If I head outside for some fresh air, within seconds I'm "normal" again - clear-headed, wide awake, able to do complicated mathematical equations in my head (OK, perhaps not the last one).

There's something very weird going on...