They soon understood that the strange, senseless experiences we call dreams often take place during REM sleep. While many creatures and also birds reveal signs of REM sleep, reptiles as well as other cold-blooded animals do not. A research in rats additionally revealed that particular nerve-signaling patterns which the rats generated throughout the day were duplicated during deep sleep. This pattern rep might help encode memories as well as boost knowing. People who are under anesthetic or in a coma are frequently said to be asleep. Nevertheless, individuals in these problems can not be awakened and do not produce the complex, active mind wave patterns seen in typical rest. Rather, their mind waves are very sluggish as well as weak, in some cases just about undetected.

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