Sooner or later, most of us have difficulty getting to sleep and staying asleep. If that sounds like you, rest assured there are ways of meeting the challenge if you make sleep a priority and make lifestyle adjustments that improve what the experts call your “sleep hygiene.” We consulted Harvard sleep specialist Dr. Lawrence Epstein and learned there are myriad tools available in your sleep toolbox. Dr. Epstein is the faculty editor for the Harvard Health Publishing special health report  Improving Sleep.