I am not looking to turn-off notifications completely, but instead, I ideally would like to be able to have Android delay all notifications until a certain time in the day, say 21:00, or whenever I decide is a good time to be bothered by Facebook and e-mail distractions. Is there an app for this? If not, what sort of techniques do you use to limit notification distractions barring just turning them off completely?
(Disclaimer: This was originally asked on productivity.stackexchange.)