Hey James, it pretty much happen every night, HOWEVER, not every night is the same, occasions like we having lately are few and when it happen you will see people going "nuts"...
To be able to see it well with naked eye you must be in a great darkness or star lights and in your case "easy"... follow
This link and every time you see numbers above 4 and better 5+ you may see it with naked eye, of course late night is better...
http://www.aurora-service.net/aurora-forecast/
I hope it helps and gravel_ben may be able to give you more advise.
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