Have you ever realized your insomnia may be caused by the pillow you sleep everyday?
Studies have shown that the world's 600 million insomnia, there are 150 million is due to the pillow does not apply, and unscientific pillow is the primary factor to cause a variety of sleep disorders.
I was shocked by this study, and suffered from the insomnia, but I don't know what pillow is the scientific pillow to sleep, and how long should we change the pillow.Waiting for your advice, thank you!