You know, the same way one might forget to eat food. I keep a bottle of migraine zappers for this exact occasion when I wake up in the middle of the night with my head exploding and I’m like “oh. right. I’m dependant on a substance. nice fumble, dweeb”
I personally haven’t gotten addicted in the first place, although if I feel like crap in the hours before bed, I’ll have a coffee to make me a bit sleepy. That’s probably an ADHD thing honestly. And the funny bit is how I’ve always gotten told to not consume caffeine before bed, but like, just a few hours ago I had 2 coffees and some dark chocolate, totalling around 280mg of caffeine, and I’m probably gonna drift off to sleep soon.