A study participant with the device used to record pupil movements during sleep. © Neural Control of Movement Lab / ETH Zurich Though sleep is a time to power down ...

A person’s pupils may be of different sizes (anisocoria) for several reasons, including physical trauma, response to light, and infection. The condition may also be present from birth.

Pupils from Gordonstoun - King Charles’s former ... The gruelling endurance challenge involved Gordonstoun students running at night through woodland and mud. It follows timetable changes ...