What are the creatures called who eat time in the Steven King book 'Four past Midnight'?

Four past Midnight is a collection of novellas by Stephen King. It is his second book of this type, the first one being Different Seasons. The collection won the Bram Stoker Award in 1990 for Best Collection and was nominated for a Locus Award in 1991. In the introduction, King says that, while a collection of four novellas like Different Seasons, this book is more strictly horror with elements of the supernatural.

One of the four novellas is 'The Langoliers'.

When a plane passes through a mysterious time warp, all but ten passengers onboard vanish. The survivors manage to land, and discover that time seems to stand still--and the mysterious Langoliers are in hot pursuit. The Langoliers' job is to erase moments in time that have already passed into history. The survivors still exist because they were asleep when the plane passed through the warp, and they determine that if they can all be asleep once again when the plane returns, they will survive. However, one passenger must remain awake - and doomed to die - to pilot the plane on its return through the warp.