Control group Patients in the control group will benefit from occupational therapy sessions program in same group as those in the intervention group, except the lighting conditions to be normal conditions, that is to say an intensity of about 50 lux. They will be conducted by specially recruited for the project educator in a comparable local, early afternoon and during the same weeks as the intervention group. Indeed, the control group's program will begin at the same time as the intervention group. The nature of occupational therapy sessions offered to patients in this group are similar to those made during the sessions in the intervention group. This point seems important because it allows a certain degree of adjustment of the environment between the intervention and control, while minimizing the management of differences, patients do not benefit all group sessions in usual care .