Clear Cut Keto So, when does this type of care become truly necessary to ensure the health and safety of the ward? Below are some of the most common reasons people invite caregivers to stay overnight.Dementia or Alzheimer's disease Both dementia and Alzheimer's disease are progressive diseases that impair a person’s memory. With dementia, the ability to reason and think logically is also gradually lost. For these reasons, an awakening in the middle of the night greatly disorientates the patient, because of which he may stumble and fall. If a person lives alone, he can also be frightened and upset as a result of such an awakening.