Stroke can cause sleep deprivation by a multitude of different ways. Those include, but are not limited to, 1) Post stroke anxiety, 2) Post stroke depression, 3) Medication effect, 4) Post stroke sleep apnea, 5) Uncomfortable body positioning due to weakness/stiffness, 6) Alteration of sleep/wake cycle. The full list would quite long. Without knowing more specific information, it would be hard to pinpoint an exact cause. However, it would certainly not be unexpected for a stroke victim to suffer from sleep deprivation.