Singer-actress Ariana Grande follows her grandmother's advice and sleeps in "minimal" clothes.

"I sleep in very minimal clothing. My grandmother encourages nude sleeping,` contactmusic.com quoted 21-year-old as saying.

Grande, who is dating rapper Big Sean, also sometimes lets her dogs sleep with her because she loves the pooches very much.

"I have four pet dogs: Ophelia, Coco, Toulouse and Fawkes. I love animals more than I love most people. I'm a vegan as well,` she said.