Sleep

Alcohol and sleep: why a nightcap makes your rest worse

Alcohol can help you fall asleep faster, but it fragments the second half of the night and reduces the quality of recovery.

Many people use a drink in the evening to relax and fall asleep, and alcohol does have a sedating effect that can shorten the time it takes to drift off. The problem comes later in the night. As the body processes the alcohol, sleep becomes lighter and more fragmented, with more awakenings in the second half of the night. Alcohol also suppresses rapid eye movement sleep, especially early in the night, and the effects tend to grow with the amount consumed.

These changes matter for anyone who trains. Studies show that alcohol before bed raises resting heart rate and lowers heart rate variability during sleep, both signs that the body is under more stress and recovering less effectively. Alcohol also acts as a diuretic and can relax the airway muscles, increasing nighttime trips to the bathroom and worsening snoring or sleep apnea in those who are prone to them. Combined with its negative effect on muscle protein synthesis after training, heavy evening drinking is a poor partner for recovery.

You do not have to give up alcohol entirely to sleep better, but timing and amount make a difference. Keeping intake moderate, having your last drink at least three to four hours before bed, alternating alcoholic drinks with water and avoiding drinking on the evening of a hard training day or before an important session all reduce the impact. If you rely on alcohol to fall asleep regularly, consider other wind-down habits such as a consistent bedtime, dim lights and a screen-free routine, and talk to a doctor if sleep problems persist.

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