Jellyfish Cassiopea, first animal without a brain or central nervous system but still it sleeps
New Delhi, September 25: We tend to think that during sleep we restore our brains and a time to process memories to prepare for a new day. But even animals that do not have brains need to sleep. According to reliable sources, Scientists have found that jellyfish go into a sleep-like state, making them the first animal without a brain or central nervous system to do like that.
Howard Hughes from California Institute of Technology in the US. Researchers studied Cassiopea that is a stationary jellyfish native to mudflats, mangrove swamps, and other warm, shallow waters. These were kept in tanks with artificial seawater in labs. Cassiopea do not look like a typical jellyfish but they are silver dollar-sized, splotched with black pigment, and rest upside-down on the sea floor.