You may take sleep for granted, but research suggests many planets that could evolve life don't have a day and night cycle. It's hard to imagine, but there are organisms living in Earth's lightless ...

Strikingly similar accounts of alien encounters are often rooted in the brain's ability to generate vivid, real-feeling ...

We spend one-third of our lives asleep. This biological fact is something that, with time and technology, is less and less taken for granted. In many science fiction stories, the future of sleep is ...