Is it good to drink milk before going to sleep?

Milk is a very common beverage, rich in many essential nutrients required by the human body. It effectively replenishes vital nutrients such as high-quality protein and calcium. Some people prefer drinking milk in the morning, while others favor consuming it before bedtime. However, some individuals believe that drinking milk before sleep may be detrimental to health. So, is it beneficial to drink milk before going to bed? Below, we address this question.

Is it beneficial to drink milk before bedtime?

Yes, drinking milk before bedtime is beneficial for health. Nighttime—particularly about 30 minutes before sleep—is considered the optimal time of day to consume milk. Drinking a glass of milk 30 minutes before bed exerts calming and mild sedative effects, helps alleviate tension and anxiety, facilitates faster onset of sleep, and promotes deeper, more restful sleep. Additionally, consuming milk before bed may help prevent conditions such as osteoporosis. However, excessive intake should be avoided, as it may cause indigestion; a moderate serving of 250–300 mL is generally safe and appropriate. Appropriate amounts of milk and dairy products are nutritionally valuable components of a balanced diet and do not impose excess caloric burden on the body—rather, they supply essential nutrients the body requires.

Knowledge Extension: Who should avoid drinking milk?

1. Patients with kidney stones

A sudden, short-term increase in urinary calcium concentration is the most significant risk factor for stone formation. Approximately 2–3 hours after consuming milk before bed, calcium from the milk reaches peak excretion via the kidneys. During sleep, urine becomes more concentrated, thereby increasing renal calcium excretion and raising the risk of stone formation.

2. Individuals with lactose intolerance

Milk contains high levels of lactose, which cannot be directly absorbed by the human body. Instead, lactose must first be broken down into galactose and glucose by the enzyme lactase in the digestive tract. In individuals with lactase deficiency, lactose remains unabsorbed. Moreover, patients who have recently undergone abdominal surgery—such as women who have had cesarean deliveries—should avoid milk postoperatively, as it may cause intestinal bloating and hinder recovery; therefore, milk should be strictly avoided during this period.

The above outlines whether drinking milk before bedtime is beneficial. We hope this information is helpful to you.