The head of the bed faces west, which means facing west. This is a placement method.
The bedside should face south or north. The head of the bed faces west and sleeps in the opposite direction to the rotation of the earth. Naturally, at the same time, your physical fitness will definitely be worse than other directions when you sleep.
Just like we take a bus, if you pay attention, you will find that sitting in the opposite direction to the car will definitely make you feel tired. Especially for people with carsickness, this effect is more obvious. Because you have to take out some physical strength to offset the kinetic energy consumption caused by relative motion. The reason why the head of the bed faces west is the same as this.