Something very common in 50+ yo people is disrupted sleep. See e.g. https://medlineplus.gov/ency/article/004018.htm You can find a lot more if you want to read about it. The worst of it for me was waking up very early - no real way to go back to sleep before it was time to get up for work.
What can help is glycine. Buy it as a powder, it is cheap, should be available at your local health food store or organic grocery store. Take a gram in some water an hour or so before bed. There is no health downside to trying it or using it.