1. Sleep on your back or your side NOT your tummy.
If you have lower back issues particularly with the discs it can be helpful to use an extra pillow or cushion between your knees if you are on your side or, if you are laying on your back you can bend your knees up and sleep with the extra cushion under your knees. This reduces the pressure on the discs of your lower back.
2. Use a correctly fitted pillow
Your pillow should help you maintain your spinal curves while at the same time keeping your spine in as neutral a position as possible.
3. Don't curl up too much with your head tucked in to your chest!
I know it has been cold but with the invention of hand held devices like phones, iPads and the likes many of us are looking down way too much. We are seeing a significantly increasing number of people (children and teenagers in particular) with reversed neck curves. If you can at least sleep with your neck in an optimised position, at least that is 8 hours (or should be 8 hours) of good neck posture each day.
Giving you my honest opinion on all things health related. Keeping it real and from the heart.