A headache that occurs the next morning, approximately five to twelve hours after alcohol consumption, is common and is called a delayed-alcohol induced headache (or a hangover headache).
A hangover headache usually occurs on both sides of the head and is located on the forehead and/or the temples. It is pulsating, like a drum beating on your brain, and is generally worsened by physical activity, which is why most people want to lie on a couch when enduring one.
Once a person's blood alcohol level has declined or reduced to zero, their headache resolves. Regardless, hangover headaches go away on their own within 72 hours.
It is worthy to note that alcohol consumption can trigger someone's underlying primary headache disorder. So if you already suffer from migraines, cluster headaches, or tension-type headaches, drinking alcohol may precipitate your usual headache attack.
This may explain why people who experience one of the above primary headache disorders tend to drink less alcohol or avoid alcohol altogether.