News Animals To test sleep, researchers don’t let sleeping jellyfish lie Experiments suggest that upside-down jellyfish are the first brainless animals that snooze SNOOZING JELLY Some Cassiopea jellyfish regularly enter a sleeplike state, a new study finds. Caltech By Mariah Quintanilla September 26, 2017 at 4:52 pm - More than 2 years ago Share this:Share Share via email (Opens in new window) Email Share on Facebook (Opens in new window) Facebook Share on Reddit (Opens in new window) Reddit Share on X (Opens in new window) X Print (Opens in new window) Print View the video The life of a jellyfish may seem like a real snooze, but until now biologists were never certain if the gelatinous blobs actually slept.
