Night sleep: 2 hours

Last night was one of my more successful (and productive) nights yet on this sleep schedule. I slept approx. 2 hours in four 30-minute intervals (10:30, 1, 5, 6:30) and just finished my first morning nap (9am). How do I feel? I wouldn't trust myself with any equipment (or knives) and I'm a bit reluctant to ride my bike to school, but I feel I have decent focus and only a slightly delayed response. I've got a decent amount of brain fog if I stop and think about it. I've got a 3 hour class this afternoon, but it's fairly interesting and so I hope that staying awake isn't too difficult. Then the bigger challenge will be to make it through a consecutive night without oversleeping.