Clean up your diet.
Sleep disorders can stem from a poor diet causing inflamation in the body, which will cause you to toss and turn and not sleep well, or have delayed REM sleep. Poor diet can also lead to things like candida/yeast infections, intestinal flora imbalance (IE: bacterial dysbiosis), and imbalance in brain chemicals necessary for effective sleep.
Cut out the carbs, sugars, caffeine, alcohol from your diet. 1/2 of everything you eat should be green veggies. Eat good protein, like eggs, beef, salmon, and eat good fats, like nuts & advocado. Don't eat anything after 6pm (some folks toss and turn on a full stomach). Take a multi-vitamin daily.
If you follow this diet for about a week or two, and don't see improvement, then go see your doctor.