A twin size mattress is a common mattress size that is often used in small bedrooms. They are typically around 39 inches wide and 75 inches long, making them a good option for people who are shorter or who have limited space. Twin size mattresses are also a popular choice for children's rooms, as they are not too large or too small and are typically affordable.
People who sleep on twin size mattresses generally do so because they need a smaller bed or because they are on a budget. Twin size mattresses are also a good choice for people who like to sleep on their side or stomach, as they are not as wide as queen or king size mattresses.