Physical Pain
Any condition that makes you feel uncomfortable is going to influence sleep. This includes medical conditions like arthritis, fibromyalgia, injuries, back pain, and any other painful problems, like GERD, heart burn, and indigestion. If you are experiencing chronic pain, it is best to talk to a doctor.
Aside from pain caused by musculoskeletal conditions and injury, you should also consider discomfort from an old mattress. If you are sleeping on an uncomfortable surface, you will struggle to find a comfortable sleeping position and may even wake up in pain. Try changing the number of pillows, as well.
