There is still chance to experience the Northern Lights in Kiruna, and you can also stay overnight in a Igloo, or in such a cabin with fireplace in the middle where you can enjoy the heat and at the same time experience the Northern Lights (Aurora Borealis) through large pannorama windows in the roof. Book your stay in Kiruna in a cabin inspired by the traditional Sami tipi tent with Kiruna Guidetur.
https://arctic-charter.blogspot.com/2019/03/aurora-village-in-kiruna.html