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Progressive neurocognitive pathologies frequently alter the structure of sleep through: advanced sleep phase or phase delay, sleep fragmentation, decrease in slow-wave sleep, REM sleep, nocturnal agitation and wandering, or even complete reversal of the circadian rhythm. This has a clear impact on the health and quality of life of the patient. Hospitalization increases the risk of sleep disturbances due to inactivity, sensory deprivation, and daytime hypovigilance. Therapeutic gardens offer a chance for adapted physical exercise in an attractive, sensorially stimulating setting that is exposed to natural light. Their impact on the quality and quantity of sleep in cognitive behavioral units has been evaluated in an exploratory manner. A hypnogram of two groups of 30 patients was compared depending on whether they used the garden (weather permitting, in summer) or not (in winter). The results show that patients who use the garden are significantly more active during the day, sleep for longer at night, and are less restless at night. In addition, patients who use and walk longer in the garden benefit from an increase in their sleep time. Given their multiple benefits, therapeutic gardens, if they meet validated design criteria, should be integrated more widely into establishments for people with neurocognitive diseases.