Like Scandinavians, the sun in summer shows no indication to sleep. From within the Arctic Circle, it appears to observe that the “midnight sun” never sets, but simply travels around the horizon in a circle.
The further north you go, the more days of midnight sun there are – in Svalbard, it shines for a steady 126 days.
The phenomenon is caused by the tilt of the earth as it orbits the sun. This lopsided angle ensures that the North Pole always faces sunwards in summer…and sits in darkness all winter long.