Imagine someone sitting in a staff meeting who missed the last three minutes of discussion because they fell asleep with their eyes open. And it's not that the meeting is boring, it's because they only got four hours of sleep the night before. Can you relate? I certainly can. Many a time I have been at work and barely able to keep my eyes open. This is why caffeine was invented if you ask me. But why am I so tired? Well, perhaps a look at the evening before could be most telling.