天黑请闭眼天黑请关灯
[tiān hēi qĭng bì yăn tiān hēi qĭng guān dēng]
Directly translates to 'when night falls, close your eyes and turn off the lights'. It could refer to a game instruction (like Mafia/Werewolf Game), bedtime routine or signify peace/quiet entering a world of darkness and tranquility/rest.