Apple recently released a free update to iOS 9.3, the operating system for iPhone and iPad. The most interesting addition this time is the ‘night shift’ function. After sunset, the screen gets a rosy glow that is less bothersome to the eyes  and should ensure a better night’s sleep. In the Dagblad van het Noorden on SaturdayApril 23 you will find an interview with Marijke Gordijn about the disadvantages of blue light in the evening ….