A sleeping pillow is a cushion or pad that is used to support the head and neck while sleeping. It is designed to help maintain the natural alignment of the spine and reduce pressure on the head, neck, and shoulders. Sleeping pillows come in a variety of shapes, sizes, and materials to suit different sleeping positions and preferences.

Some common types of sleeping pillows include:
Down or feather pillows: These pillows are filled with the soft plumage of geese or ducks. They are lightweight, fluffy, and moldable.

Memory foam pillows: These pillows are made of a dense, viscoelastic foam that conforms to the shape of the head and neck. They provide excellent support and help to reduce pressure points.

Latex pillows: These pillows are made of natural or synthetic latex. They are firm and supportive, and they are hypoallergenic and resistant to dust mites.

Buckwheat pillows: These pillows are filled with buckwheat hulls. They are firm and supportive and can be easily adjusted to suit different sleeping positions.

Gel-infused pillows: These pillows are filled with gel to provide a cool and comfortable sleep surface.

Synthetic pillows: These pillows are made with polyester, microfiber, or other synthetic materials. They are budget-friendly, easy to care for and come in various shapes and sizes.

The right pillow for you will depend on your sleeping position, personal preferences, and any health conditions you may have. It's important to choose a pillow that provides proper support and comfort to help ensure a good night's sleep.