When a person starts getting relief from artificial supports, he definitely starts getting used to it, just as you said that when you are tired, you like to drink black coffee, although black coffee is not normally used to relieve fatigue, but since black coffee helps you in relieving your fatigue, I think you have become accustomed to it. Control this habit of yours because worldly supports lead a person to degradation. Bring yourself closer to nature and when you feel tired, go out in the fresh air and take deep breaths and relax by lying on the grass. Relax your nerves. This way you will feel much better. Do not drink black coffee because it causes blood to burn.