We're looking at having a long weekend in Tromso, Norway with our family in February to (hopefully) see the Northern Lights. The plan includes an evening/night excursion that returns at midnight, however we have a young child (who will be 18 months when we go) and that would entirely mess up his bedtimes!
Obviously either my wife or I could stay behind and look after him, but I was wondering if there were hotels that provided baby-sitting services or if there were companies that would send a sitter to hotel to look after him for one evening? If so, had anyone had any comments/experiences they could share?
Thanks in advance.

