While the above reasons justify why you should sleep on the left side, it might be a bit uncomfortable for you to suddenly change the way you’ve been sleeping all this while. But take your time because getting good sleep (whichever way it may be) is critical for your health. It is also important to choose the right kind of mattress to ensure quality sleep. If you plan to sleep on your side, pick a soft mattress as it can put pressure on your hips and shoulders. Also, you should choose a mattress that allows you spine to rest in its natural alignment else you may be waking every morning with unnecessary aches and pains.