What would happen if you had plans to go out with friends, or just hang out with someone and you backed out because you tired, and then something happened. You would be devastated because you missed out on one last chance to spend time with them. You would be filled with remorse at not having one last chance to say goodbye. All because you were tired. Tired, is not an excuse. There may not be another chance. There may not be another day. Do not use tired as an excuse.