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</a> Another significant finding, Krystal says, is that the researchers did not see states of non-REM sleep in the hibernating lemurs. Several previous studies have suggested that a rundown of metabolic "batteries" in the brain drives the need for non-REM sleep. Over the course of the day, energy gets stripped away from cells, producing the need for humans to "recharge" cellular batteries through non-REM sleep, according to Krystal.