I used Theater Mode for the same reason last night, and it worked as you said. I already switch to a red-only Modular face ut just shows time and temperature, but it was good to keep the screen off no matter what, too. It also added another step to deactivating the alarm this morning, which wasn't annoying -- it helped shake the cobwebs of my brain.The Theatre mode is a nice feature. I sleep with my Apple Watch on so I have that Taptic alarm in the morning. sometimes the display has gone on in and is bright enough to disturb my wife when she is sleeping. Depending on how much I move at night I can burn through up to 8% at night. Had Theatre mode on last night and it burned 2% battery and my wife had no complaints about the light.