Langolier

They are ravenous fur balls with no legs and three mandibles. Their only form of sustenence would appear to be time. As time passes, they devour the universe that is left behind. The only way to come into contact with one is by being asleep as you pass through a time rift.There is no known way to fight one. If they notice you, and they will notice you, your best hope is to escape using some high-speed transportation as an airplane, then find the time rift and escape into the present/future. The mode of transportation you escape in should be from the present/future you came from; if it was otherwise found in the "past," it will simply not work. You cannot scamper away on foot, as they will always catch up.