First unplug your frame and plug it back in, then try turning all the lights off in the room, so it is completely dark, and leave the room for five minutes.
You can set a schedule for when the frame is awake or asleep in the Aura App. You can access this under frame settings in the app. Tap on the frame name, then click on "Display" and select the exact time of day you would like the frame to turn on, and when it will turn off at night. You can always change this setting back to "Auto On & Off" at any point in the Aura App.
If the frame's display is still not adjusting to light properly, please contact customer support at email@example.com