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 » Science Biology

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 » Health Conditions & Diseases

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 » Pets & Animals Pets Dogs
similar articles

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 » Science Biology

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 » Science Biology

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 » Science Biology

Environmental pressure is another term for natural selection, a process that encourages some genes to survive because they are conducive to the environment while others die. This process slowly causes a distinct species ... More » Science Biology