Daybeds are traditionally an item of furniture which has a dual purpose. Used both for sleeping on at night and for sitting on during the day. Daybeds are commonly used in spare rooms or bedrooms where space can sometimes be limited. Quite often daybeds with trundles are used to provide an extra sleeping option, useful when guests come to stay. Daybeds can also be found with additional space underneath for extra storage, sometimes in the form of storage drawers.
Historically, day beds have been used over the years in many different contexts and situations. Seen as everyday furniture items by the chinese (they did not distinguish between furniture you sleep and sit on.) and used in medieval times as pieces of furniture which were easily transported from one place to another due to their lighter weight.
Nowadays, a daybed commonly have high backs and sides with a lower front, often left, giving the appearance of a sofa as illustrated below. Daybeds with trundles are now more popular than ever and can even be purchased with valances hiding the trundle bed underneath the day bed.