Thirty-seven hours. During the night, I couldn't sleep, no matter how hard I tried. In the early morning hours, I microslept through bits and pieces of a class, but fortunately enough, I didn't miss anything. When I went to get some breakfast, I saw a lady across the room; an instant later, she was standing right there next to me, as if she had teleported. Definitely microsleep, or just a temporary lack of awareness on my part.
When I got out of class, I went to take a nap, but I couldn't fall completely to sleep; I was still aware of my surroundings and still thinking consciously. My roommate was moving around and talking to his friends, and though it felt like I was sleeping for moments at a time, I still followed along with what was going on.
That was weird.
Seven hours of sleep later that night, and I was as fit as a fiddle. Weird dreams, though.