My youngest kid falls asleep in the pram and sleeps some 2-3 hours outside the house every day. Might sound like a dream. Except this winter we've had all the snow you had in Europe last year concentrated to Iceland and more. And the winds have been literally turning the pram 180°on the street corners. A home picked sea bird duvet does the trick. I use it inside the sleeping bag. But my fingers go numb sitting by the open window with hail and snow flying around the room.