The causes of insomnia are relatively complex and can be divided into three main categories: environmental factors, medical factors, and psychological factors. Therefore, there is no single cure for insomnia; one must find a suitable method based on the specific situation. Relaxing the mind, improving the sleep environment, and maintaining good lifestyle habits (less smoking and alcohol, more exercise) can all help improve sleep. If necessary, one can also take medication as prescribed by a doctor.
Additionally, dietary therapy is a very effective method for treating insomnia without side effects. Here are a few simple dietary therapy methods; feel free to add any better ones you have.
1. Drink a mixture of a glass of cold water and a spoonful of edible vinegar. This can help you fall asleep.
2. Eat an apple before bed, or place a peeled orange by your bedside. This can calm the central nervous system and help you fall asleep.
3. Crush an appropriate amount of onion, place it in a sealed bottle, and smell it by your pillow before bed. This can help you fall asleep more easily.
4. Soak your feet in warm water and drink a glass of warm milk before bed. With long-term persistence, this can establish a "conditioned reflex for falling asleep."