This is our German Shorthaired Pointer, Fritz. He is 2 years old and is the perfect dog for us. Fritz is loyal, obedient, respectful and active! The high point of Fritz's day is the long run we take every afternoon.
Scientists say they may have found the reason why we need to sleep. Photograph: Corbis Scientists in the US claim to have a new explanation for why we sleep: in the hours spent slumbering, a rubbish disposal service swings into action that cleans up waste in the brain. Through a series of experiments on mice, the researchers showed that during sleep, cerebral spinal fluid is pumped around the brain, and flushes out waste products like a biological dishwasher.
It's not a question of why we sleep, but why do we have periods of being awake, and this answer is obvious. Over time, our sleep state evolved or changed, or evolution simply favoured a more productive state. I apologise for not making much of an effort to explain my imagination on this subject, I am simply too tired.