Using smartphones and tablets right before bedtime or in bed pose a risk to our ability to fall asleep and to the sleep quality. Daylight is beneficial and necessary during the day, but very unhelpful at any other time.
A selection of the many studies and analyzes that have been made about daylight and its importance to how well we function.
For millennia we humans have known that daylight controls our daily rhythm, and that daylight is necessary for us to function. Very early on it has also been known that when we lack daylight, predominantly in the Nordic countries during the winter, it affects our wellbeing and functionality. The Sami have since centuries back been aware of the negative effects of winter darkness and attempted to compensate for it. (It is with inspiration from this that Needlite's logo contains an interpretation of the Sami's sun symbol, as a tribute to the light).