I flared up my cold in solid fashion. Moved to more of a head cold, which I haven't had for two years, at which time I had three in a row and it killed my running. Did not want to take the day off, but realized any running at all would not help anything (other than anxiety of having to take days off at this stage in a marathon). Can't really do much work either, and I need to grade. Slept a bit in the middle of the day with the aid of some nightime medicine.