Factors such as negative mood, fatigue and alcohol play a large part in self-control failure.
Previous effort is one especially well studied factor that decreases self-control. All else being equal, a second self-control attempt after an initial one is more likely to fail than one that comes after a relatively restful period when no self-control was exercised.
Self-control is the ability to regulate and alter responses in order to avoid undesirable behaviors, increase desirable ones, and achieve long-term goals. Research has shown that possessing self-control can be important for health and well-being. Common goals such as losing weight, exercising regularly, eating healthy, not procrastinating, giving up bad habits, and saving money are just a few worthwhile ambitions that people believe require self-control.