That sentence is incomplete, so I can’t tell what “sleeping with…” refers to.
Different things have completely different consequences, and I don’t want to guess wrong and give you misleading or dramatic info.
Common possibilities people usually mean:
- sleeping with your phone
- sleeping with makeup on
- sleeping with wet hair
- sleeping with contact lenses
- sleeping with a fan/AC on
- sleeping with someone (relationship/sexual meaning)
Reply with the full sentence (or just say which one), and I’ll give you a clear, detailed explanation of the real effects—no exaggerated “warning” nonsense.