Animals & Sleep: Clockless Reindeer and Falling Seals

Research continues to show how sleep differs among animals.One study published last month examined the daily, “circadian” rhythms of reindeer. Researchers from the U.K. and Norway found that its melatonin production is not controlled by a circadian clock.“The molecular clockwork that normally drives cellular circadian rhythms is evidently weak or even absent in this species,” the authors