"You need to put easy, nice, tranquil thoughts in your head before you go to bed. You know what I do? I read metaphysical books. The good stuff stays in your brain once you go under."

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What differentiates time from space is that time does have a direction. In that sense it is different from space. I think that's certainly true that whereas spatial dimensions don't have direction or an arrow, time does. It runs from past to future. But I see that arrow of time as rooted in a deeper metaphysical reality, namely the reality of temporal becoming - of things coming to be and passing away. That is why time has this arrow. But it's not sufficient to simply say that time and space are distinct because time has a direction. The question will be: why does it have a direction?

— William Lane Craig