1) Bone-deep weariness, a shortness of temper, an overwhelming depression at how little has been taught and learnt this term, melancholic contemplation of other possible careers
2) A trance-like state caused by heady anticipation of the holidays, leading to stupidly late nights and a general attempt to burn out not fade away
3) The slow but irreversible degeneration of lessons into quizzes, games, videos and other mindless issues. Alternatively, a rarer but more virulent strain causes a rash of tests and mock exams. These lead to terrible bouts of marking, often delayed for many weeks and manifesting themselves when the sufferer believed themselves to be symptom free
Heads of Department, Faculty, School and others will find themselves suffering from Present Allocation Disorder. PAD is caused by desperately trying to work out whom to buy presents for, and how much to spend. Most schools have this nasty condition well-managed by a complex wine cascade, in which senior managers give middle managers bottles of wine from Marks and Spencers, and middle managers give their juniors bottles of wine from ASDA and so on.
Commiserations to all of you suffering with me at this time of the year. Some people hold summer bouts to be the worst, but in my opinion, the Christmas version, with its bacchanalian overtones and endless bags of Haribo, is the nastiest.