In neurologically intact individuals, reduced sleep is associated with numerous health problems, including hypertension, decreases ventilatory drive, increased sympathetic cardiovascular activation Insomnia is a disorder that is defined by the subjective complaint concerning the duration and quality of sleep. It is associated with numerous medical complications and poor rehabilitation outcome. There is a strong link between sleep disorders and several neurologic disorders commonly encountered in routine neurorehabilitation practice. The proper diagnosis and treatment of sleep disorders in a neurorehabilitation setting could be important to maximize outcome. Sleep disorders are often comorbid with neurological disorders, such as Parkinson’s disease, multiple sclerosis, traumatic brain injury, and stroke. Sleep is essential for healthy brain function and plasticity underlying learning and memory.