It is not recommended to drink lemon water before going to bed, lemon water can be drunk, but it is recommended to drink two hours before bedtime because of the following factors: 1. The most common factor is because the acidic effect of lemon will stimulate the mucosa of the gastrointestinal tract, and if drunk before bedtime will lead to acid reflux, causing acid reflux gastritis, bile reflux gastritis, and long-term lemon water before bedtime will also cause ulcers of the stomach, esophagus and duodenum. 2, If you drink a lot of lemon water before bed, lemon water has a certain diuretic effect, will cause frequent urination at night, urinary urgency, frequent night urination clinical symptoms and performance. 3, lemon water has a certain hypolipidemic and hypoglycemic effect, diabetic patients who drink too much lemon water before bed, will lead to sleep paroxysmal hypoglycemic reaction, especially at dawn will lead to the dawn phenomenon.