The Aurora Borealis goes on all night in Akureyri, Iceland; however, the clouds, moon and weather prevent the human eye to see it all the time. We were lucky enough to be able to catch the Northern Lights on our trip.
It was just like how the old Icelandic folklore described it...like lost children dancing in the night sky. The more they danced, the happier they were.
Needless to say, it was an unbelievable experience.
TIP: Look up the lunar calendar prior to booking your trip so that the moon is not full when want to see the Aurora Borealis (better chances of seeing it when the moon is not full).