Due to no air conditioning and California summer temps, I've been blissfully sleeping outside every night in my 1.1 double Blackbird. Most comfortable sleep ever! However, a scary thought intrudes--am I wearing it out? Every night means several zipper operations--in, out, late night excursions, pack up...Does anyone have any experience on how long the Bird lasts with daily use? I'm thinking hard about how to bring it inside for winter sleeping. Getting so I'm forgetting how to bed sleep!