Pretty much what WarriorSkull said, but also, avoid innuendo and stupid sayings that aren't real English. Begin learning a foreign language like German or Russian and you will see what is wrong with English - too many extra words!
Sometimes I drink coffee before I go to bed (multiple times a day). A horrible strategy if you suffer anxiety or depression, but sometimes drinking organic fairtrade coffee 2-3 times a day can boost my mood. It also aids my ability to communicate quickly and pick up on the other person's words more quickly. Otherwise I just ramble and forget what I was saying mid-sentence. Social isolation sucks.
Coffee doesn't always help. A few days ago I had a coffee in the evening but I fell asleep shortly after. Life is tough and I am prepared to have days in which I fall asleep in the afternoon. It happens to me in hot months as well as cold days just before the winter.