Admission to a surgical intensive care unit (ICU) following major surgery is associated with a number of discomforts, not only related to the disease itself, but also to the care provided or the ICU environment itself (lights, sounds, pain, sleep deprivation, thirst...). This discomfort is real, and can be associated with psychological consequences. The investigators hypothesized that the use of immersive virtual reality (IVR) with HypnoVR® is feasible and can help reduce discomfort in intensive care.The ZION trial is a prospective, monocentric trial, randomizing 194 patients admitted in a surgical intensive care unit after a major surgery. The inclusion criterion are patients admitted in a surgical intensive care for at least 48 hours following major surgery (cardiac, thoracic or major abdominal surgery). Patients will be allocated to the intervention group (n=97) or the control group (n=97). In the intervention group, patients will receive IVR using HypnoVR®, twice a day, during the ICU stay (2 to 5 days). In the control group, postoperative care will be conducted according to standard cares without IVR. The primary endpoint will be the 18-items IPREA questionnaire on the day of ICU discharge. The secondary endpoints will include intensity of discomfort symptoms (anxiety, pain, dyspnea, thirst and sleep deprivation), incidence of delirium, cumulative morphine consumption at ICU discharge, length of ICU stay, and anxiety or depression at 1 month after discharge from intensive care and patient experience of device use.