A mattress is described that provides phototherapy and physical support to a subject. The mattress comprises a gel material and a set of light sources. The gel material provides a cushioned support surface and is optically translucent to the therapeutic electromagnetic radiation. The set of light sources emit electromagnetic radiation which can be selectively controlled and diffused through the gel material onto the subject. The efficacious wavelengths of electromagnetic radiation are incident on the subject supported by the mattress.
