Is Sleep Tiring?

You see, I go to bed and spend hours trying to get tired enough to drop off into a sleep and then when I wake up I feel absolutely exhausted!

Now, I am far from being an expert but isn't that the wrong way round? Aren't you supposed to be tired before you go to sleep and then feel full of energy when you wake up??

AM I MISSING SOMETHING HERE???

(Apart from sleep that is)