Canada's night length changes throughout the year. This is important to keep in mind when thinking about the amount of time people have to watch the night sky. This year, the night lengths range from about 18 hours in January, to 5 hours in June, to 12 hours in December. This shows how much time the Inuit had to watch and notice things in the night sky.

Source(s)

http://www.timeanddate.com/worldclock/sunrise.html