Glance Screen Settings (as accessed from Settings > glance screen):
Off - well, no glance screen will be seen with this setting
Peek - Glance screen will be turned on for a moment right after the screen is turned off and when something is waved over the top part of the screen (over the proximity sensor) when the screen is in standby mode
Interval - Glance screen will be turned on at a default/pre-determined constant time frame
Always on - Glance screen will always be turned on when the phone is in standby mode
Content - toggling any of the features listed here (Date, detailed status notification, quick status notification) will add more details in the Glance screen. Note for the Background app, you must set a compatible app (MSN Weather or Health) as the lock screen to display the information of the app in the Glance screen.
Exception - the description says you can choose to always show the glance screen when the phone is plugged in to a charger
Night mode - allows you to choose either not to show the glance screen or change to color of the glance screen within a user-defined time period (which can be set by changing the "Start time" and "End time"), or to disable night mode feature by selecting "Off".
You may want to visit this
link for more information about the Glance Screen.