eli5: How are my eyes able to see in the dark?

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This happens all the time and I don’t know exactly how my eyes do this. When I turn off all of the lights in my room to go to bed, all I see is pure darkness (which is self explanatory). I close my eyes and go to sleep. However let’s say 15 minutes later, I have to get out of the room. Now when I open my eyes, I can see everything (like all objects such as the door, tv, and drawers). I just think my eyes adjust to the darkness, but I would like a scientific answer as I am curious to know. I find it bizarre and fascinating that this can happen.

In: Biology