If you put off doing something today that was probably important because you were too tired then all you accomplished was to let the tiredness set in. Free yourself from being tired by feeling good about your efforts because when you take care of something and get it out the way it actually energizes you. Don't let tiredness take over and hold you back from your duties and responsibilities. Don't procrastinate and justify your tiredness. When you fulfill yourself with positive, focused, effective effort, there is no room for tiredness in the face of accomplishment. Avoiding difficulty becomes a burden overtime , so your better off working through the challenge and getting energized for each positive action you take. Remember there is no substitute for hard work.