First, the sleeping problems.

The clock hits 1 a.m, you lay awake in bed. Your mind is empty, it wanders, you continue to lay there.

2 a.m.

Then 3 a.m

Finally, by 4 a.m, you fall into a light doze only to woken up at 7 a.m, searching for coffee.

If this narrative sounds familiar, you may be at risk for a neurodegenerative disorder later in your life.

Sleeping problems often accompany.

Causation or correlation?

https://www.scientificamerican.com/article/why-sleep-disorders-may-precede-parkinsons-and-alzheimers/