Causes of headaches when waking up:

Dehydration: Lack of water in the body can lead to headaches, especially after a long sleep.

Stress: Work and life pressure can cause stress, leading to tension headaches.

Ischemia: Poor blood circulation can cause lack of oxygen to the brain, leading to headaches.

Remedies:

Drink enough water: Make sure to provide enough water for the body, especially before going to bed.

Relax before bed: Do relaxation exercises, meditate or listen to soft music to reduce stress.

Massage, warm/cool compress: Massage the head, neck and nape of the neck or apply warm/cool compress to relieve pain and improve blood circulation.

Use Oriental medicine to activate blood circulation: For cases of headaches caused by anemia, you can refer to using Oriental medicine to activate blood circulation to increase blood circulation to the brain.