Do you brush your teeth right before bedtime?
I came across a newspaper article that said that the peppermint flavor in toothpaste can bring about a release of dopamine. It can be counterproductive to brush teeth with minty toothpaste right before going to bed because it can wake you up.
Duh
Well I went through an
experimental period of figuring out a way of brushing my teeth without waking myself up.
First I kept the bright lights off, and I tried children's Bubblegum flavored toothpaste (I believe it was SpongeBob SquarePants). Then I realised it was the cold water I'd rinse with that woke me up. (The bathroom is far from the water heater, so I'd use cold water rather than wait four minutes for hot water.) So then I brushed my teeth in the kitchen where the water heats up quickly. Still I'd wake up. Ultimately, I found out that it's the act of brushing itself that would drive away my tiredness.