He found that he was sleeping 15 minutes longer each night and summing the arithmetic progression, calculated that he would die on the day that he slept for 24 hours.
Siya natagpuan na siya ay natutulog ng 15 minuto na bawat gabi at lagom ang arithmetic paglala, kinakalkula na siya ay mamamatay sa araw na siya slept para sa 24 na oras.