Noticeably below the recent great progress. To the extent that it has made me wonder if it was a bad day at the office, or a rest day.
One of the crap things about this time of year is the amount of cold and flu viruses in circulation - hopefully he continues to avoid them, and this was more a case of "I am ahead of schedule, so let's Bank some of that with some sleep catchup". I'm anticipating it is the latter, given he has been putting in some long days recently and he's switched on about sleep dep.