Each evening, write down three things that went well today, and for each one, a line about why it happened. That's it. In the original study, people who did this for one week were measurably happier — and less depressed — and the effect was still there six months later, long after most had stopped writing them down. It's the most replicated exercise in positive psychology.
Why does something so small do so much? It's a direct counter to the teflon. Once a day you make the good stick — you force the joy detector on duty, aim it at the day you actually had, and bank three things before they slide off.
Three things separate a practice that works from a rote list that fizzles:
Be specific. Not "my family." Instead: "my daughter reached for my hand crossing the road without looking up." Specific memories carry the feeling; generic ones are just filing.
Ask why it happened. The 'why' is doing quiet, important work. "The walk was lovely" is a nice note. "The walk was lovely *because I finally left my phone at home*" — now you've found a lever you can pull again. The why turns a good moment into information about how good moments get made.
Include your role in it. When you can, notice your own hand in the good thing. Not to take credit — to correct a bias. Depressed and stressed minds systematically under-credit themselves for the good and over-blame themselves for the bad. Spotting "I made that call I was dreading, and it went fine" gently rebalances that.
Everything. The three good things do not have to be big, or impressive, or gratitude-for-your-health worthy. "The coffee was exactly right." "Someone laughed at my joke." "I got the parking spot." The size doesn't matter; the noticing does. In fact tiny-but-specific usually beats big-but-vague.
On a genuinely rotten day, this is not a demand to paper over it. Three good things can coexist with one very bad thing — "today was hard AND the dog was thrilled to see me" is a truer sentence than either half alone. You're not arguing the bad away. You're refusing to let it be the *only* thing that got recorded.