In cetaceans—unlike in other mammals—breathing is a voluntary action that involves returning regularly to the surface. Sperm whales take naps in vertical position, and when dolphins sleep, half of...
A recent study reveals that these large mammals, known for their legendary memory, only have short phases of sleep. This surprising discovery could give rise to new strategies for combating insomnia.
However mysterious and uncontrollable, dreaming is a brain activity like any other, and one that researchers can look into. Interview with neurologist and sleep specialist Isabelle Arnulf.
Sleep is a loss of time and—at least for wild animals—increases the risk of being attacked and eaten. So why has evolution perpetuated this function? According to the biologist Paul-Antoine Libourel...