I have an overactive mind, and a moderately stressful life that has lately been making it difficult for me to wind down and fall asleep. I have been taking diphenhydramine tablets before going to bed, which seem to help me wind down. I understand that Benadryl is one of the safest sleep aids there is, and I would not consider taking medicines that are more potent, but my question is, how many nights in a row can I do this before becoming physically, or at least psychologically dependent on them? I do not want to depend on any external medication or supplement to fall asleep.