highway hypnosis
n.— «Even without actually falling asleep, drivers can go for miles in what some experts call “highway hypnosis,” with their reflexes slowed and their judgment impaired.» —“When lack of sleep can kill” by Melinda Black Daily Herald (Chicago, Illinois) Feb. 11, 2008. (source: Double-Tongued Dictionary)
Further reading
A French idiom that means “to sleep in” or “lie around lazily in bed after waking” is faire la grasse matinée, literally to “make the fat morning.” If you fall in love easily, you’re said to have un coeur...
What do you call a segment of an orange? These juicy pieces of fruit go by lots of different names, including section, wedge, and carpel. But they’re also called pegs or even pigs! The stringy parts of a banana also have a surprising name...