Diablo 3 made me sleepy yet Diablo 4 is extremally addictive. Just me?

I say this respectfully and I've been trying to figure this out. I purchased Diablo 3 maybe somewhere around 2021 as a game for my lady and myself to play together. I had a bit of experience playing D1/D2 back in the day, however I was more into playing Baldur's Gate: Dark Alliance and similar games like that then.

For some reason, Diablo 3 made me legit sleepy. I also couldn't get though it long enough to have the ability to increase the difficulty. I didn't have to think too much to get things done and it was so easy to just get up and dust yourself off. I understand that it get's better after a certain point, however I want to stay I stopped after a few hours in.

Playing Diablo 4 though? Feening for it. I knew I would be when I first saw a long gameplay video of the game. Played it and I was right. I'm not sure if D3 making me sleepy is actually a case of boredom, however I just wanted to see if anyone has experienced something like this before.