Bunk for a vehicle cab

A bunk for a cab of a vehicle, comprising:

• a frame having a front beam and a rear beam which extend along a transverse direction, and side beams which extend along a longitudinal direction, the front, rear and side beams being secured to one another, the frame defining an inner surface and further comprising attachments for attaching the frame to the cab;
• and
• a supporting structure coupled to the frame and extending over the inner surface;
• wherein, in a normal state, the side beams maintain a nominal distance between the front and the rear beams;
• each side beam comprising at least a front segment connected to the front beam and a rear segment connected to the rear beam, wherein the segments extend along the longitudinal direction, are linked to each another and have a length smaller than the nominal distance, the front and rear segments being in a first relative position in the normal state;
• and
• the bunk being configured to change from the normal state to a collapsed state in a vehicular collision in which the front and rear beams are spaced apart by a distance that is smaller than the nominal distance, and in which the front and rear segments remain linked to each another while being in a second relative position different from the first relative position.