In iOS 15 and iPadOS 15, Apple expanded the concept of Do Not Disturb to what it calls Focus. You can create a Focus for different types of activities so only specific people and apps can break through your cone of silence at appropriate times.
Focus subsumes the old Do Not Disturb functionality and your settings may not transfer when you upgrade leaving you open to being woken at night by a previously silenced notification.
To check and reset things to your liking, visit Settings > Focus > Do Not Disturb. If necessary tap Add Schedule or Automation to set a schedule or try the new Smart Activation option. Then decide who potentially beyond those in your Favorites should be able to get through along with any apps that might be essential. Note: you shouldn’t enable the Do Not Disturb switch at the top that turns on the Do Not Disturb Focus immediately.
(Featured image by iStock.com/klebercordeiro)