I wouldn’t say the brain is more active when you’re asleep. Some parts of the brain are more active when you’re asleep than awake, but other parts are more active when you’re awake than asleep. Generally your brain activity is just different during sleep. A group of scientists in America published their results of an experiment in 2008 which showed that neuron activity important for learning is less active during sleep! This means it is probably best to revise for exams while you’re awake, rather than listening to a tape asleep! 🙂
I agree with Tim, it’s not that your brain is more active, it’s just active in a different way. There is a type of brain pattern called an alpha wave, which is quite common during sleep, so it looks like a lot of brain activation, but it’s just different activation to ‘awake’ brain patterns.
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