So to be honest, I am surprised I've never seen this brought up. If it has, I've still never seen this topic around. But here goes.
Recently, I've been following the features present in the Elder Scrolls Online, and one of the features that stood out for me was the 3 Night Cycles present in the game. Sure it isn't a "big" feature, but something this small adds a lot to the game. Its the smallest things in WoW that most of us fell in love with when we first got into it.
So what does this mean then? Basically, time in game isn't going to be in real time like 1:1 to time in the real world as in WoW. If anyone has played Skyrim or any of the Elder Scrolls RPGs you would understand what I mean. However, Skyrim and the other RPGS usually have it set to 20:1 in the game world by default, so time flies by faster. However, its going to be similar but a bit more slower, more like 3:1. So you get to enjoy 3 cycles of night in a 24 hours period - a day on Earth.
So I was wondering if something like this could be implemented in WoW. I have always enjoyed myself questing under a dark sky or during the night. I still remember my early days playing WoW, questing through Westfall and Redridge Mountains under a black sky with stars shinning. However, these days or recently, I've often not been able to play the game during the nights and miss these moments.
I think a similar approach to the Elder Scrolls would allow even the day players to enjoy nights more often. This way it adds a lot to the game. It can be quite immersion breaking thinking about it on a RP realm to actually travel from one corner of Azeroth to another on a gryphon in a few mins.