I have a very romanticized idea of sleeping porches. I don't even think I've ever slept in one but the logical part of me thinks they are probably drafty.
I think this looks like a particularly wonderful one, although I don't understand why porch chairs are always so uncomfortable. I would switch out that furniture for some comfy arm chairs and a big, squishy sofa that I could naps on in the afternoon.
Photo via Ada & Darcy