This is why I gave up taking books out with me...without fail, I'd get lax and that's when a deer would come in. Ditto for the one and only time I nodded off on a stand.
FWIW I never use blinds. I use a chair and sit against a backdrop, just inside some brush/grass, lay in the grass, or down inside the edge of a ditch. I'm more successful than when I was younger and used blinds. I've found blinds are only useful when you set them up so far in advance that the deer are always used to them being there. If it's a new shape in the environment, human or not, it draws their attention. One of my favorite spots in college was very similar to what you described.