Why isn't the dark ... dark?

So I was going to sleep and had all my computers/gadgets off, and it was pitch black dark, I couldn’t see my hand in front of my face, but I noticed, it doesn’t look dark, sure there is a lot of black but there seems to be a bit of light, kind of like static, but very very little of it, I’m sure you know what I mean. Why is this? Is it our brain trying to see something?