In the quiet hours of the night, while your body rests, your brain is busy. It's sorting through the day’s moments, filing some away as lasting memories, and brushing off others. Scientists have long ...

You might refer to it as "sleep" or "eye gunk" - but whatever you call it, most of us wake up with a bit of crust in the corners of our eyes. It's such a routine part of our morning that we barely ...