Tom had a recurring problem of oversleeping in the morning. He was always late for work. His boss became angry and threatened to fire him if he showed up late for work again. Tom explained that he had trouble sleeping and was always tired. The boss suggested he go see a doctor about it.
So Tom went to his doctor who gave him a pill and told him to take it before he went to bed. Tom slept well, and in fact, woke up before his alarm clock even went off. He had a nice healthy breakfast and drove leisurely to the office.
Tom arrived at work early, stepped in the door, and announced proudly, “Boss, the pill the doctor gave me actually worked!”
“That’s all fine” said the boss, “but where were you yesterday?”