The canvas exhibited here is one of the first works in which the famous Belgian artist interprets surrealist poetics with a personal language, addressing the theme of sleep. L’épreuve du sommeil, or The trial of sleep, is the title chosen for this work, dated between the end of 1926 and the beginning of the following year. The head of a woman lying with the nape facing the viewer is framed from a very close observation point, which excludes the rest of the body and the furnishings of the room from the field of representation, except for a white cloth. It is on this element that the critics have focused, attributing different meanings to it, linking it to biographical events - such as the traumatic memory of the suicide of the mother, drowned in a canal and fished out with her face covered by her clothes - or interpreting it as a quote from a 'work by Man Ray of 1920, consisting of a sewing machine packed in a blanket that hid its shape, thus underlining Magritte's desire to update himself on the novelties proposed by the Parisian surrealists. Will that also emerges in the detail of the female hair made with a comb technique, already proposed by Max Ernst in some of his works. Magritte wrote in his own hand with a brush on the back of the canvas, as was his custom, the title of the work, which was exhibited in Brussels in 1927 at the artist's first solo exhibition.