A sleep mask is a soft, padded accessory worn over the eyes to block out light, helping to create a darker environment for better sleep. They are often made from materials like cotton or silk and can come in various shapes and sizes. Many people use sleep masks during travel or in bright rooms to improve their sleep quality. In addition to blocking light, some sleep masks may also include features like cooling gel or aromatherapy scents to enhance relaxation. They are popular among individuals who struggle with insomnia or those who work night shifts, as they promote a more restful sleep experience.