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When day transitions into night I love the games that really make you feel it's quiet and dark outside, and something changes about the atmosphere. it's things like this that help me get immersed in the game i'm playing and I think day/night transitions are very important.
The only game that i've played that in my opinion had the coolest night time was Anarchy Online. it was really dark, and you could hear crickets and stuff. But it was painfully dark to see things and it added a sort of alone feel to it. Another mention would be Darkfall. EQ1 was alright too.
Current MMO: WoW/GW2