To incentivise Swedes to wake up on cold winter mornings, Lufthansa and DDB Stockholm created an alarm clock app, Anywake, that doubles as a chance to win discounted flights.

Set the alarm and it'll wake you up to the sound of a randomly selected city. To turn off the alarm you have to guess which one. Clips are 60 seconds long and contain clues to where you are; such as music, references to famous places and hints of historical occasions. If you get it right, you get a discount on a Lufthansa flight to that specific city. The free app is available for iPhone and Android, at present just for the Swedish market.