Hi! I tink he likes to sleep the cuz of the humming sound the fan makes? I read that tis kinda sound are called white noise. Tey r sounds like hair dryer,water running,humming of car or fan etc. These noises calms the baby. My boy is fussy wen ot comes to sleep,he need sto be carried n pat to sleep. No matter hw tired he is,he will stil fuss till you carry n pat him to sleep. The unusual part is that my dad can put him to sleep in an instant. My mum says its bcuz tey r the same chinese zodiac,tiger. So tey connect veri well. Haha same frequency.