I thought this was a myth. Nope. I have been infected. Apparently, this particular ailment has quite a long incubation period, remaining dormant for years. Once the symptoms surface, it is too late, there is no treatment, it must run its course. And it will, after all, graduation is only 2 months 2 weeks and 5 days away.
Symptoms include: chronic procrastination, lack of motivation, coasting, slowness, apathy regarding school work, existing in a lame duck situation, increased social & extra-curricular activity, preference to enjoy oneself over academic work
C'est la vie.
Interestingly enough, not all opinions on Senioritis are bad, with many researchers and deans of colleges feeling it a healthy balance for a student to engage in non-academic activities. I found this article on high school senioritis, and rather enjoyed it. Hope you do too.