YSK: Bugs are naturally attracted to light sources. To make a fly or another annoying bug leave your bedroom, try turning off all the lights in your room and turning on all the lights in another room like the kitchen or patio.
from /r/YouShouldKnow
YSK：蟲子自然會被光源吸引。要想讓蒼蠅或其他惱人的蟲子離開你的臥室，可以嘗試關閉你房間的所有燈光，並打開另一個房間的所有燈光，如廚房或天井。