This is just window dressing, but I think elves don’t sleep.
I was listening to a discussion over on the Roll for Initiative Podcast about whether AD&D ever said that they don’t. Clearly elves are immune to sleep spells in the old school editions, but actually needing sleep? While they were discussing it, someone IM’ed them and told them it was an option 2e rule from an elf handbook.
I am all in favor of elves never sleeping. To elves, sleep is a close cousin to death. they only sleep when sick or injured. Elves only have beds in their hospitals (or wherever they heal).
Elves don’t need bedrooms, even for lovemaking. They go to the woods or something. Having sex on a bed is, for an elf, akin to having sex in a coffin or on a gurney. Which is to say, some very few of them really love it, but most of them wouldn’t be into it.
So elves can handle the entire night’s watch, unless they need to rememorize spells. Maybe there should be some chance they will be distracted by visions or something. Otherwise, every party will have an elf. Ideas are welcome.
Me? I like anything that alienates elves from humans.
Half elves? Eh, don’t even get me started. I don’t think there are any.