If you're thinking about discarding your pillow, then you definitely need to consider your sleeping position. This affects the needs of your body and your spinal alignment, and different sleeping positions have different requirements. Ultimately, the most important thing is to keep your spine optimally aligned.
Sleeping on your side without a pillow
If you enjoy sleeping on your side, then we do not recommend sleeping without a pillow. Doing so will lead to pain in your cervical and dorsal areas.
If you sleep on your side, use a pillow or choose a neck pillow support your head and fill the hollow between your neck and the mattress. This will align your neck with your spine and relieve any pressure and pain in your neck and shoulders.
Sleeping on your back without a pillow
You can easily discard your pillow if you like to sleep on your back. However, sleeping this way makes snoring more likely. This is because your tongue blocks the passage of air when you breathe. So if you're sleeping with a partner, this may not be ideal.
While there are no medical disadvantages to sleeping without a pillow if you lie on your back, you have to consider your personal requirements and your partner's needs. If you snore and don't want to wake up your partner at night, then choose to rest on a pillow.
Sleeping on your stomach without a pillow
Sleeping on your stomach is the best sleeping position if you sleep without a pillow. Your neck will be well aligned with your spine and you won't be in any pain. You'll easily find a natural position. If you like, you can also use a small folded pillowcase to add a bit of height to sleep one.
That said, this isn't the best position to sleep in if you're a woman - and especially if you're pregnant. This sleeping position is also not recommended if you have respiratory problems.