The 34-year-old shared about his nightmare, while promoting his new children's book 'Nightmares', reported People magazine.
"Witches were eating my toes!" Segel said when asked about his worst recurring nightmare.
He he has written about the dream in 'Nightmare' because 'it's such a strange visual and it was very specific'.
The actor deals with his nightmare by praying in morning and evening. "Lying in bed, I actually rethink a lot of stuff, to make sure it's okay," he said.