There is a direct link between self-control and positivity. Think about it: are you more likely to cave in and eat an entire pack of cookies while wallowing in your feelings and procrastinating when you’re feeling positive about life, or when you’re sad and needing comfort? The more positive your mood, the easier it is to exercise self-control and focus on the tasks you need to complete. Do what you need to do to stay positive.
Source: learn.filtered.com