Open Question: Benadryl extra strong for sleep?

嗨. I am 20 years old, my doctor prescribed me some diphenhydramine help me sleep me. Diphenhydramine great job, but now I did not set me against him again. I went out and bought super allergic to diphenhydramine. It will help me sleep, or do I risk? I do not take allergy, but is still sleeping, I do not have time to see a doctor, because all of my final exam in the week.谢谢.