I suffer from leg muscle pain quite often. it is intense sometimes and makes sleeping difficult for me. what medicine should i take to relieve the pain?

Most analgesics even the over the counter (OTC) medications have significant side effects if you use these for a long period of time. You need to see an internist or preferably a rheumatologist, for finding the cause of your leg pain and treat the cause, not just the symptom. In a short time, you can take acetaminophen or ibuprofen (if there is no contraindication) for the pain as needed.