A study has shown the young of those two species do not sleep at all during the first month of life. They are active 24 hours a day -- and their mothers have learned to cope.
'Somehow these seafaring mammals have found a way to cope with sleep deprivation, facilitating rather than hindering a crucial phase of development for their offspring,' Dr Jerome Siegel, a neuroscientist at the University of California - Los Angeles (UCLA), said in a statement."
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