[header] How to sleep on your back comfortably [title] Elevate your head with pillows. [step] Using one to two pillows to raise your head four inches will make it easier for you to breathe as you sleep. You may also want to consider buying pillows that are specially designed to keep your neck muscles relaxed and open, allowing you to get a more comfortable sleep. 
[substeps] Sleeping with your head elevated can be especially helpful for those who have sleep apnea or acid reflux. You may need to try sleeping on one to two pillows for a few nights to determine how many pillows you require to be comfortable when sleeping at night.