I don't think the day/night cycle within the game is going to affect your circadian rhythm directly.
Yes, the blue light of a daytime sky scene might have some percentage more of an effect than at night, but it's very different to being out in the real world. Your screen is still shining light at you regardless, and some of that light is blue. Factor in blue-tinted spells, menus, dungeons, and anything with a mixed colour that is partly blue - not to mention that all light, not just blue light, is bad for your circadian rhythm - and it's nowhere near as simple as "my body will understand it's night-time if it looks like night in the game!"
For that matter, night scenes in the game are going to be rendered with a blue-ish colour anyway. Not as bright as daytime, but it's still blue light coming from your screen. And in the 'daytime' you're just as likely to be seeing yellows and browns on the ground as looking up at the sky.
I'd be very interested if there's actually a study on whether portrayal of time-of-day within a game can affect your perception of the time-of-day outside of it, but I would be surprised to learn it's the case. Games have been portraying short day/night cycles for decades, and I've never heard of it being proposed as an issue.
If you're really concerned about it, perhaps you can adjust your own screen settings towards red light.


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