The Real Impact of Gratitude Journaling: Small Steps, Subtle Benefits
A note on what follows: we are writers and editors reading the research, not clinicians or psychologists. These are patterns measured across thousands of people, and one of the studies below is a survey rather than an experiment. A pattern in a crowd is not a prescription for any one reader’s inner life.
Gratitude journaling often gets lumped in with trendy self-help tactics like vision boards and manifestation exercises, which can leave many readers skeptical. The idea of listing three good things before bed can provoke an eye roll, and rightly so. Healthy skepticism is essential because much wellness advice lacks rigorous testing, and the burden of proof lies with the claim rather than the doubter.
So, what does the science say? Does gratitude journaling hold up under scrutiny?
What Large-Scale Research Tells Us
A major 2025 review published in Proceedings of the National Academy of Sciences (PNAS) pooled data from 145 studies involving 24,804 participants across 28 countries. This comprehensive meta-analysis concluded that gratitude interventions do indeed produce a benefit for well-being, but it’s modest—a Hedges’ g of 0.19. To put it plainly, people who engage in gratitude practices tend to report slightly better well-being compared to those who don’t. While this is a positive outcome, it’s far from the dramatic transformations often touted by wellness marketers. Notably, the effect size varied by country, suggesting cultural factors influence how gratitude impacts well-being.Source
Another 2023 review focusing on randomized controlled trials of gratitude interventions brought a somewhat brighter perspective. Analyzing 25 trials with a total of 6,745 participants, researchers Abdurrahman Kirca, John Malouff, and Jai Meynadier found that expressed gratitude had a statistically significant positive effect on psychological well-being, with a Hedges’ g of 0.22.Source
Beyond Well-Being: Sleep and Prosocial Behavior
While well-being tends to dominate the conversation around gratitude, two other important threads emerge from the research: sleep quality and helping behavior.
In a survey of 401 individuals, Alex Wood and colleagues observed that higher levels of gratitude predicted better subjective sleep quality, longer sleep duration, reduced sleep latency (the time it takes to fall asleep), and less daytime dysfunction.Source However, this was a correlational, one-time snapshot study rather than an experimental design, which means it can show association but not causation. In other words, grateful people tend to sleep better, but the study doesn’t clarify if gratitude leads to better sleep or vice versa.
On the social front, gratitude appears to encourage prosocial behavior in a more direct and experimentally supported way. A 2006 study by Monica Bartlett and David DeSteno at Northeastern University demonstrated that gratitude increases people’s willingness to help benefactors—even when helping is costly or unpleasant. This effect was distinct from simply feeling good, indicating gratitude itself motivates real, sometimes costly acts of kindness.Source DeSteno later elaborated that gratitude not only encourages repayment of favors but also promotes paying kindness forward to strangers.Source While promising, this should be regarded as a well-supported hypothesis rather than a definitive fact.
Why a Small Effect Still Matters
At first glance, a Hedges’ g of around 0.19 or 0.22 might sound trivial, especially when considering a single session of gratitude journaling. However, the value of this practice lies in its accessibility and cumulative effect. Gratitude journaling costs almost nothing—just a few minutes and a pen—and can be repeated as often as desired.
Think of it as a small, low-effort habit whose real power comes from consistency. Sitting down a few times a week to jot down a handful of things you’re thankful for doesn’t promise to make you instantly happier or solve sleep problems. Instead, across large populations and cultures, this practice nudges well-being, sleep, and social behavior in a positive direction over time.
Whether this modest but steady nudge is worth a few minutes several times a week depends on your personal values and circumstances. The scientific data can inform this decision but cannot make it for you.
If low mood or poor sleep is weighing on you, a qualified counsellor or doctor is the right person to talk to.
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