One common trait that all humans and animals share is the need for sleep. Even though sleep is a necessity for humans and animals to properly function, there are many disorders that interfere with sleep, such as insomnia and night terrors. Another disorder that certain animals experience is called "local sleep" where part of the brain sleeps while the animal is still awake. Two big questions researchers have are why this happens, and if it can also occur in humans. (Image courtesy of Wikimedia Commons).
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