Drinking water before going to bed is not good, especially for patients who have heart failure or renal insufficiency. If you drink water before bedtime, it is likely to cause edema or induce heart failure. Patients are advised not to drink water after 7 pm. If the patient really has kidney failure or heart failure, then it is often necessary to limit the amount of water drunk in a day, for patients with severe heart failure, it is often limited to 500ml, and it is also recommended that the patient should not be too emotional before bedtime, so as to ensure a better sleep. In addition, patients are advised to combine regular rest with not sleeping too late every day, because in actual clinical practice, lifestyle interventions are essential for the improvement of the disease.