Macbook screen blacking out suddenly

Hi all,
While using my Macbook, the screen suddenly goes black.
The screen goes black apparently randomly, sometimes it does, sometimes it does not.
My Macbook is on my table, which I guess is pretty well ventilated too.
After pressing the spacebar and other keys for a while, the blacked-out screen will just go back to normal.
What is the problem? I would be glad if anyone could offer any advice.
Thank you.

Go to system preferences, go to energy saver, at the top with the scroll down menu you can change settings for power adapter or battery, and below that option there's optimization settings. And while you are there, go into options (button beside "Sleep") and see if there's any options you may want to change as well. You may have to click the little pad lock icon at bottom left corner to make changes.
Any more questions just ask away. If you think any of the advice here are helpful you may want to click the little icon to mark each post "helpful" or "solved".

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