You ever look back to your childhood and think "ohhhh that was OCD"?
Growing up I had two sleep-based obsessions: I could NOT sleep if I was hungry, and I was terrified of wetting the bed.
I ended up creating a ritual every night to manage these obsessions. When I was ready for bed, I would pee, drink a glass of milk, and then wait exactly 5 minutes before peeing once more. Only then could I sleep.
I knew it wasn't necessarily normal but didn't connect the dots until much later in life when I started suspecting I had OCD.