It's nearly autumn and I've always wanted to go fall camping, but never had the proper gear or knowledge for it. How do I keep warm at night without spending millions of dollars on a second set of high tech winter gear, or carrying massive bulky quilts? I have a 3 season tent that has no way to cover 3 of the 4 mesh windows letting a breeze in and heat out, and I have a sleeping bag rated for 5C (41F) comfort (it's actually closer to 8-9 for me since I'm a skeletor with no body fat).

I'll be camping in Northern Ontario which starts to drop below 0C (32F) at night in mid-October. I already have a full body merino base layer, which helps a lot, but won't be enough if it goes below freezing. On my latest camping trip it dipped to about 6C in early morning and I was uncomfortably cold even wearing my hoodie in bed.