Background. There is ample evidence that, on a group level, optimists are happier and healthier than pessimists. Knowledge is still lacking on why optimists generally do better in life. Optimistsmay benefit from more adaptive emotion dynamics, and their advantage in life has also been attributed to the more adaptive coping and emotion regulation strategies optimists use. Only few studies on optimism and emotion dynamics exist, but studies on wellbeing more in general suggest that higher wellbeing is characterized by higher stability, lower variability and lower inertia of positive and negative emotional states. Methods. The present study uses ecological momentary assessments (EMA) to examine whether emotion dynamics of people with higher levels of optimism are characterized by higher stability, lower variability and lower inertia of positive and negative emotional states, and whether results are similar for high and low arousal emotions. Baseline data on trait optimism and EMA data on positive and negative affect will be used from two existing Dutch samples. Sample 1 consists of 185 participants (age 18-61) who completed EMA five times per day for 14 days, and sample 2 consists of 390 participants (age 18-74) who completed EMA three times per day for 30 days. Dynamic Structural Equation Modeling (DSEM) in Mplus 8 is used to analyze the data. Results. During the presentation results will be discussed. Conclusion. A better understanding of the link between optimism and emotion dynamics may shed a light on the advantages of optimism for wellbeing and mental health in daily life.