However, you should not stack them together, but use them to keep your spine in a neutral position and reduce pressure on your spine.
Because our body structure cannot perfectly fit the bed, our spine is actually under considerable pressure while sleeping. This is where the second pillow comes in handy.
If you prefer to sleep on your back, placing a pillow under your legs can reduce pressure on your spine by half and help maintain the normal physiological curvature of your waist.
If you prefer to sleep on your side, keep your knees slightly bent, but do not curl them up to your chest. Placing a pillow between your legs can relieve pressure on your back and spine.
If you prefer to sleep on your stomach, you may experience tension in your back, neck, and temporomandibular joint, so this sleeping posture is generally not recommended. If this is the only posture that helps you fall asleep, you can place a pillow under your pelvis and lower abdomen to reduce pressure.
Finally, if you have been troubled by sleep problems for a long time, try using a new pillow that suits you, and you may find unexpected benefits! Remember, stay positive and do not focus on negative aspects.