Why won't my Macbook Pro go into sleep or screensaver mode?

For some reason my MacBook Pro stopped going into sleep or screensaver mode. I have always had my computer set on the most energy efficient settings. It used to go into sleep and screensaver mode just fine. I did not make any changes to my settings (and no one else has access to my computer) and now it just will not go to sleep by itself and it will not go into screensaver. The only light on my computer that still dims is the keyboard, it will dim when it is supposed to. Occasionally, my computer screen will randomly dim when it is supposed to, but then it will brighten again without me touching anything. Even more occasionally, it will go into sleep and screen saver mode, but this hardly ever happens. Can someone please tell me what is wrong?

You could check Activity Monitor and see if something is running in the background stopping it from going to sleep or having the screen saver come up.
That is what it sounds like. A program is keeping it from sleeping.

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