Brushing teeth is a habit likely to be performed regardless of sleep quality or life stressors due to deeply embedded task bracketing.

“In fact, brushing our teeth is a pretty good example because for most people, even if you got a terrible night's sleep, even if everything in your life is going wrong, chances are, unless you're very depressed, if you're going to leave to work, or even if you're not, that you're going to still carry out the behavior of brushing your teeth in the morning.”