I agree with Tiger when it comes to sitting behind a game all day. The fresh air really does help. Even if it is just a walk. Also I think loneliness can be a cause of sleepiness and low energy but due to the depression that comes with loneliness for some people.
I've been extremely sleepy. Low energy. Can barely do anything productive. Is loneliness causing it? If so, how to overcome?
If you are sleepy and low energy then first sleep and if you still feel sleepy and lonely then play game outside or hangout with friends