Sony Xperia users should be very familiar with the Stamina Mode on their device. For those that are clueless on this, it is a form of settings that is designed to boost battery life drastically when activated.
Now, a new discovery is made and it confirms that the Stamina Mode will not allow the clock app from Google to wake you up. In other words, any alarms or reminders that are set with the default clock app will not function like normal.
Of course, there is a way to override this particular feature and it is through installing a new clock app for the Sony Xperia. Once installed, you are required to whitelist the application to ensure it functions normally even when on Stamina Mode