REM sleep is also called paradoxical sleep because in this state, the sleeper is difficult to wake-up in spite of showing the brain waves associated with waking, hence the term paradoxical, as the state itself is somewha... More »

Paradoxical chest movement is when the normal chest movements of respiration are reversed, with the chest wall moving in during inspiration and out during expiration. Also known as paradoxical breathing, it is a sign tha... More »

Dogs dream during the REM phase of sleep, just like humans. There is evidence that they dream about their daily activities. They often twitch, vocalize and breathe differently while dreaming. More »

Most people can stop the problem of drooling in their sleep by changing their sleep position. Dr. Celite Kushida of the Stanford University Center for Human Sleep Research advises people with sleep-related drooling issue... More »

You do not swallow saliva in your sleep because facial muscles are relaxed. Most people wake up with saliva in their mouth, which is instantly swallowed once that person wakes up. While sleeping, people do produce saliva... More »

Humans need sleep because it is an essential process to maintain health. Sleep is necessary for cognitive functions, such as memory, emotions and learning, as well as physical functions, such as cardiovascular performanc... More »

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A niche is a scientific term used to describe the relationships between a species and the elements in its ecosystem. It is determined primarily by the way a species reacts to environmental factors, such as food sources a... More »