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How does your body know when to sleep and wake up? For a long time, scientists thought that your brain dictated your body’s internal clock. Now Australian and French researchers have found that the liver has a say, too.

If you’ve ever flown overseas, you might have experienced jetlag. For example, daytime in London is night in Sydney, so your body can get very confused on a journey between the two. But jetlag isn’t just a human phenomenon, or even just an animal phenomenon. Turns out sunflowers can get jet lag too!

Getting out of bed some days feels like too much effort. If only night lasted all day, just like it does for the blind Mexican cavefish. Like the fish, you just might save some energy by living in an endless night.