I REALLY like the OPs suggestion. There are lots of us who are grieving that there is NO semblance of day/night. The ambiance alone of night adventuring is a seriously missed element of BG3.

Oh how I remember the dark woods in BG2 when you encounter the shadow wolves and the werewolf when infiltrating the temple of Amaunator to save Mazzy and wipe out the evil presence there! It was so dark and spooky.

Oh, or the streets of Athkatla at night after you learn that someone has been murdering people and skinning them, or how vampires ambush you in the dark streets or thieves, jumping you out of nowhere.

I've imagined in BG3 roaming the dark ruined streets of Blighted Village at night, learning about the missing children and the murders. How I pictured exploring it when suddenly out pops ettercaps from one of the buildings, springing on you in the night. There is evidence they travel out of their lair, for they went as far as the bog to kill a parent and child. How spooky the whole ambiance would be.

Oh! And the tollhouse! You arrive. What is that in the ground. You light a torch. Severed arm. Pools of blood. A howl goes up in the night.

Aaaaargh! Larian! We flipping need Night Travel! I absolutely detest "sneaking" into the goblin camp in broad daylight. It's asinine! Especially for Drow MCs. They would detest walking around by day, and the ambiance for 90% of EA is ruined by broad daylight, not to mention time standing still.