Clogged sink? Soda helps

Of course, regular cleaning of the sink drain is the best, unfortunately did not know my young neighbor. Quick help brought my soda - the simple paper bag costs little - so I kicked him off.

As something leaked, so the runoff was not complete, we poured boiling water into the drain. In the preheated siphon then a few tablespoons of soda and again hot water after. Finished in the evening, now at 3 o'clock in the morning he rang my bell to say it worked. What drives a student out of bed so early?