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.
According to Stanford biologist Craig Heller, the function of sleep is one of the major unanswered questions in biology.. Heller and a former graduate student may have found the answer to that question, at the level of individual brain cells.or example, experimental evidence that sleep need increases when the brain is heated, such as during exercise, has led some researchers to argue that sleep serves as a temperature regulation and recovery process for the brain.