By Mashable India
The first month of a bottlenose dolphin's (Tursiops truncates) life is spent without sleep.
Female fruit flies (Drosophila melanogaster) have been observed to snooze for an average of 72 minutes each day, with one specimen sleeping for only 4 minutes per day.
Bullfrogs (Lithobates catesbeianus) appeared to not sleep in one experiment because they consistently responded the same way to stimuli.
It was formerly believed that creatures without a central nervous system, such as jellyfish (like Chrysaora fuscescens), either did not require sleep or are incapable of it.
However, recent investigations have shown that this is not the case. It was discovered that jellyfish do, in fact, experience a sleep-like condition at night.
Another species that is able to experience unihemispheric sleep is the big frigatebird (Fregata minor). Great frigatebirds, unlike dolphins, can use this tactic sparingly.
These birds only slept in half of their brains during their lengthy, transoceanic trips, and they only did so for a duration of 42 minutes, according to small sensors that recorded brain activity