When sleep researchers have studied humans and other species, they found that:

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Research has found that nearly all mammals experience REM sleep, with the exception of a few species such as spiny anteaters, bottlenose dolphins, and the porpoise. Humans begin to show evidence of REM sleep around two weeks after birth, and moles are capable of experiencing REM sleep despite their limited eye movement. Therefore, option D is the best choice as it is the most accurate statement based on research.

When Sleep Researchers Have Studied Humans and Other Species, They