Sleep Cycle May Originate in Ancient Oceans

What do we humans have in common with ocean plankton – specifically  the marine ragworm, Platynereis dumerilii? Melatonin. Scientists at the European Molecular Biology Laboratory recently discovered that melatonin, the hormone that regulates our sleep and waking cycles, also regulates the rising and falling of Platynereis larvae. (1) The Platynereis dumerilii are centipede-like worms that produce larvae […]