I thought it was an OCD thing...
Actually, nully, I have had more experience with sleep deprivation than I ever intended to, and noticed a 'fatigue point' where behaviour is similar to OCD after 24-36 hours with less than three hours of sleep, or a protracted period with 3-4 hours of sleep (total) each 24. I wonder if fatigue/stress can't produce similar but more temporary conditions.