Do elves sleep instead of trance in Pathfinder?

On the Common Terms page of the d20PFSRD website, the "Rest" section says:

The Pathfinder Core Rulebook is somewhat vague on the requirements of resting and sleeping […]

I found that this is true.

Is there any errata that addresses the argument about how elves sleep/trance/rest?

Their immunity to magic sleep seems to indicate that designer either forgot to mention that elves don’t sleep as humans do, or they mistakenly left that immunity from 3.5 re-design.