Repeat after us: "Today is my day. I'm thankful for me." Positive self-talk can help you focus on what's good in your life, says psychologist Joy Harden Bradford, Ph.D. Research shows that a little vitamin G (for gratitude) can make you feel happier and more satisfied and even improve your sleep. "If you repeat an affirmation related to gratitude in the morning, you're likely to show and feel more of it throughout that day," Cupig agrees with Joy Harden Bradford!