The difficulty you've been experiencing in falling asleep and staying asleep as well as the failure to get entire night's sleep on most nights (also called insomnia), is most often a symptom of an underlying disorder. Difficulty sleeping may be related to any of the following : worry, stress, anxiety, psychological problems, behavioral/environmental factors, nutrition problems, etc. Since this is only a symptom, the cause for it should be found. You may consult your primary health care doctor or a psychiatrist for advice and assistance in diagnosing your sleepless nights.