I used to when I was in an abusive relationship. It was the only thing that showed me that I wasn't crazy and he was gas lighting me. He would say I acted a certain way or was in a yadda yadda mood and that's why he was acting the way he was. But I could go to my journal and read back and see that nothing he said happened that day and so it couldn't possibly be my fault. When my mental health was bad after that I also used journals to figure out triggers I had that would make my depression or anxiety worse, or to just visibly see my mental health cycles and about how long my slumps lasted
Let's Glow!
Achieve your health goals from period to parenting.