I downloaded the dev preview of WP 8.1 and temporarily set my region to US in order to test Cortana. During my testing, I could configure the so-called quiet hours feature.
After I've tested Cortana to my heart's content, I set my region back to what it originally was. The reason for that has to do with the store, the different regions' different currencies and the fact that I use pre-paid cards to buy stuff.
Now that Cortana's (temporarily) gone from my phone, I noticed I still get notifications in the middle of the night (from 2 AM to 6 AM); so obviously the quiet hours feature didn't work.
Is there a way to enable that feature without enabling Cortana, or am I forced to set my region to US until Cortana is available in my region, if I want to sleep well at night without toggling all notifications every time I go to bed or wake up?