**[Demons][1]**

This are the one of the abilities of a demon; (*you can refer to the link to view the other abilities*)

- **Immortality**: Demons possess eternal youth and can live for centuries, sometimes even longer if they're incredibly strong. **They can't die through conventional means**, but can be killed by sunlight or with one of the Demon Slaying Corps' special Nichirin Blades.

- **Growing Power**: The strength of a specific Demon depends almost entirely on how many humans they have eaten, and they can also grow stronger by receiving additional blood from Muzan, which is how the Twelve Demon Moons gained their overwhelming power. Some Demons, however, have a limit to how much they can use to grow stronger, and they might be not compatible with a higher amount of Muzan's blood.

Being that said demons don't need to eat humans at all to survive as they are immortal and they'd only do this because they wanted to become stronger so the answer is **Yes**, Nezuko takes the sleeping as form of nutrients to sustain herself though this not give her additional power because she's not consuming humans, she was just exhausted and use sleeping to make up for it.

  [1]: https://kimetsu-no-yaiba.fandom.com/wiki/Demon