It'empty in the daytime but full at night.What is it?

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It''emptyinthedaytimebutfullatnight.Whatisit?It''emptyinthedaytimebutfullatnight.Whatisit?It''emptyinth

It'empty in the daytime but full at night.What is it?
It'empty in the daytime but full at night.What is it?

It'empty in the daytime but full at night.What is it?
bed