Robert Stambler (born September 3, 1986) is an American sound designer and editor who worked as a sound designer for Star Wars Episode VII The Force Awakens, and also voiced the Nightwatcher worm who appears in the film, which peers it's head out of the sand of the desert to watch BB-8 roll across it to eventually find Rey.
Sources
From "Blast That X-Wing" to "Traitor": The Voices of Star Wars: The Force Awakens on StarWars.com (backup link)
External links
https://productionbeast.com/173640-robert-stambler on productionbeast.com (content obsolete and backup link not available)