Falling into Eternal Night

Tonight, I close my eyes. When I open my eyes the next day, the sun rises from the east and shines on the earth. I blow out the candle gently, turn on the lighter and light it, and the candle will burn again and release light. The thousands of stars in the sky were covered by clouds. When the clouds passed by, the stars were still shining on this ancient land. However, what should we do if there is no sun, no stars, and no energy? Without energy and light, it is eternal night.