My children slept outside in their igloo last night. My husband equipped them with head lamps, waterproof tarps, 20 degree sleeping bags, a walkie-talkie and plenty of ventilation. Around 9:00 p.m. they hunkered down for the night. It's natural for the inside of an igloo to melt a little because of the warmth from body heat. As a result, they came inside around 6:00 this morning because my daughter was tired of water dripping on her. Plans for the next igloo include wider walls and a little higher ceiling, even though my son could sit up comfortably.
I have to admit, I was the only one in my family who was a little reluctant about this adventure. But, they truly enjoyed themselves and proved to me that the adventure was worthwhile.