You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Sleep apnea syndromeFor above situations, select the most likely sleep disturbance. and explain in detail?
Sleep apnea syndrome is the most common cause of daytime sleepiness in the elderly. The prevalence (at least in sleep disorder centers) increases with advancing age. Narcolepsy (usually having started earlier in life) and periodic limb movement disorder (restless legs) are other common causes of excessive daytime sleepiness.