They soon recognized that the unusual, illogical experiences we call desires usually happen during Rapid Eye Movement. While the majority of mammals as well as birds reveal signs of Rapid Eye Movement, reptiles and also various other cold-blooded pets do not. A research in rats also showed that certain nerve-signaling patterns which the rats created during the day were repeated during deep rest. This pattern repetition may aid encode memories and also boost understanding. People that are under anesthesia or in a coma are often said to be asleep. However, individuals in these problems can not be awakened as well as do not produce the complex, energetic mind wave patterns seen in normal sleep. Rather, their mind waves are extremely sluggish as well as weak, in some cases almost undetected.

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