The SRD eliminates the notations specific to elves in the section on preparing wizard spells, which I recall from D&D 3.0 (and I believe it was in 3.5 as well).
One of the elf alternative racial traits is called 'Dreamspeaker':
Dreamspeaker: A few elves have the
ability to tap into the power of
sleep, dreams, and prescient reverie.
Elves with this racial trait add +1 to
saving throw DCs for spells of the
divination school and sleep effects
they cast. In addition, elves with a
Charisma of 15 or higher may use dream
once per day as a spell-like ability
(caster level is equal to the elf’s
character level). This racial trait
replaces the elven immunities racial
Neither of these, nor the base elf race explicitly mention that elves do not sleep.
A thread at Giant in the Playground's forums is inconclusive.
Essentially, I think it depends on the campaign setting, as the GitP link indicated, but I would lean towards, "Yes, they DO sleep for 8 hours."
Not sleeping is an explicit trait in D&D 3.x and the lack of that trait in Pathfinder indicates they are no longer special in that regard.