A recent study observed sleeping participants' pupils during sleep, using a new method that could have implications for ...

A new study reveals that pupil size fluctuates constantly during sleep, reflecting changes in brain activation levels.

Friday the 13th lived up to its notorious rep for a Long Island teen — who suffered a stroke that day in December, leading her to need brain and open-heart surgeries. “I was on a call with my ...

Scientists have discovered that our pupils continue to change size while we sleep, revealing unexpected fluctuations in brain ...