The reason you shouldn't sleep with mirrors facing you is because the mirrors reflect energy and sleeping with mirrors facing you creates a disruptive flow of energy which interrupts your sleep and can cause uncomfortable dreams.
The reason you shouldn't sleep with your feet facing the door is because the feet and head face the door and resemble how the dead is carried through open doors through and from the house.
Sleeping with your feet facing the door is called the dead man's position or coffin position and is the worst possible position to sleep in when it comes to Feng Shui.
Sleeping with your mouth open is bad as it can lead to problems as bad breath, gum disease and worsen symptoms of other illnesses.
In children sleeping with their mouth open can cause crooked teeth, poor growth and facial deformities.
The sleeping position that relieves gas is sleeping on your left side which helps with digestion and helps to relieve gas.
The sleeping position that is good for weight loss is sleeping on your back and sleeping on your side.
Side sleeping also helps to improve sleep, helps you lose weight and reduce pain, and avoid swelling in the thighs, legs, buttocks.
Sleeping on your side is also good for digestion and avoids the accumulation of fat.
The position that is the healthiest to sleep in is on your side or on your back.
Sleeping on your side or back makes it easier to keep the spine supported and balanced which also relieves pressure on your spine and also enables the muscles to recover and relax.
Sleeping on your back has the maximum health benefits and is good for your spine and in relieving your knee and back pain too.
Sleeping on back can also reduce your back or joint pain.
Also having a pillow that is kept beside your knees can help you keep the curvature of your knee aligned.
The most unhealthy sleep position is the fetal position.
The fetal position refers to the position which involves bowing your head forward, arching the back, bending at the hips, and flexing at the knees, which is particularly unhealthy because of how many parts of the body can be negatively affected.
People with heart failure might experience discomfort on their left side and prefer to sleep on their right side.
Some people that sleep on their front may also benefit from sleeping without a pillow.
It can also aid in maintaining the posture of the neck and spine as you sleep, reducing neck and back pain.
However, not everyone should do it.
Without a pillow, those who sleep on their back or side may experience neck or back pain.