During a whole week everybody at work (including me) has been sleep-walking, dragging our feet behind us, sighing and yawning. This, even though it has been warm and sunny. None of us could understand why we were so tired, almost exhausted.
Until now... We have been drinking decaf coffee! Or unleaded as they call it here. I have always thought it would make no difference. But now I know. I'm a caffeine addict.