Animals That Don't Sleep

Himanshi singh       May 19, 2020


          This happy-go-lucky marine mammal does not need to sleep…for a period of time. Newborn bottlenose dolphins (Tursiops truncates) do not sleep for the first month of their lives. The reason for this is simple: they have to resurface for air every 3 to 30 seconds.  

#Great Frigatebirds 

         The great frigatebird (Fregata minor) is another species capable of unihemispheric sleep. Unlike dolphins, great frigatebirds can utilize this strategy simply when needed. Researchers were able to rig up small devices that measured brain activity and found that while performing long-distance, transoceanic flights, 

#Fruit Flie

        Some insects sleep for extremely short periods. For instance, small percentages of female fruit flies (Drosophila melanogaster) were found to sleep for an average of 72 minutes per day, with one specimen found to sleep for only 4 minutes a day. 


        it was thought that animals without a central nervous system, such as jellyfish (like Chrysaora fuscescens), either did not need or were incapable of sleep. However, it was shown that jellyfish do enter a sleep-like state at night. Their pulsations and responsiveness to basic stimuli dropped noticeably for an extended period,


       bullfrogs (Lithobates catesbeianus) did not sleep since they reacted to stimuli in a similar manner at all times. However, this idea has been dispelled and replaced by the notion that they do snag intermittent moments of rest, though never sinking into a full, inattentive slumber. 

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