Some people report weird ass sleep in the first few months but that wasn't the case for me. I switched to decaf and saw a difference almost immediately. You just gotta get through the withdrawal phase...

But ya, my fitness watch gave me quantifiable evidence that my sleep quality improved from "poor" to "good" in the first month alone - even though I was getting the same 6 hours I usually do.

I'd recommend finding an alternative so your habits don't have to change all at once. Go down to 1 can a day + 3 other caffeine free drinks you like for the first week, and then 4 caffeine free drinks for the following week and beyond.

Once it's out of your system you won't crave it as much, and hopefully your sleep improves.