Using benedryl as a sleep aid?

for most of my late teens and now early 20's i've always had trouble getting sleep. im now 22 and for the past year or so i've been taking 3 benedryl (75mg) a night to sleep. within the hour after taking it i fall asleep no problem and wake the next morning feeling fine. i just recently came across an article on the internet on how medications can over time build up in your system and cause problems. is this something i should concern myself with in regards to my nightly benedryl usage?