Demand Hiding rolls for elves before Stalking that represents the ability of elves to hide their aura and go unnoticed. Or demand the rolls for all the races, after all, Hide and Stalk are the same skill.
...Let's consider a wood elf (the best one for hiding, in my opinion):
The best one for hiding in Woods or in everywhere? If the first then it is a enveroinment factor, the bonus to Hiding could be linked to another skill or learning. Dwarves, orcs, subterranean races can be good fighting in caves but they don't recive an innate bonus in battle axe. OTOH, I think it's being taken for granted that an agile person has to be a good-stalking/hiding one.
And I admit, my elves also sleep, how could they deprive themselves of the pleasure of a good nap?
Bye, good day to everybody