A good time for coffee is at lunch. Because a cup of coffee or other drink containing caffeine at the same time helps keep the night sluggish.
During the day, the body's performance experiences fatigue and reduces concentration on task. This happens because of fatigue in the brain. Because, people tend to feel tired and can not concentrate on the task that ranges at 2 noon.
So a cup of coffee after lunch can eliminate fatigue and improve concentration and a better mood.