My dad's dr told us about this (the PM type OTC meds & more) -
[Are Your Drugs Raising Your Risk for Dementia?
Many popular prescription and over-the-counter medicines have anticholinergic activity and can increase the possibility of developing dementia.]
http://www.peoplespharmacy.com/2015/...-for-dementia/
http://holisticonline.com/remedies/sleep/sleep_home.htm