What happens if you take Benadryl every night for years?

What are the potential long-term consequences of taking Benadryl every night for an extended period, say, years? Are there any known health risks or side effects that individuals should be aware of? How might it impact sleep patterns, cognitive function, or overall health over time? Is it SAFE to rely on Benadryl as a regular sleep aid, or are there safer alternatives available?