Baldur's Gate 3. I just can't get enough. When I'm too tired to play myself I'm watching streams of other people playing. Sometimes I get fed up for a few days but so far it has always pulled me back in.
The "worst" for me was in 2006 with the release of Gothic 3. I had saved up for a powerful new PC and taken two or three weeks off work to play. I played deep into the night. Then deep into the morning. Then deep into the day. Then deep into the evening. Until my sleep schedule was aligned with my regular schedule again at the end of my holidays.