If you mean the thin sheet tucked between the blanket/duvet and the sleeper, it’s usually called a top sheet or flat sheet.
Its main purposes are:
- Hygiene: It creates a washable layer between your body and the heavier blanket or duvet.
- Comfort: It feels lighter and cooler against the skin than a thick duvet.
- Temperature control: You can use the sheet alone if you’re warm or add the blanket if you’re cold.
- Protecting bedding: It helps keep the duvet or blanket cleaner, reducing how often the heavier layer needs washing.
- Easy laundering: Hotels can wash and replace sheets between guests more easily than bulky blankets.
However, not every hotel uses a separate top sheet. Many hotels use a duvet with a removable, washable cover instead.
So the “secret” isn’t anything mysterious—the sheet is primarily a hygiene, comfort, and temperature-control layer between you and the heavier bedding.
