[serdar3500]

I tested this not once, not twice, but thrice. I turn on the alarm at 100% battery at about midnight and wake up to a dead phone at about 930 (alarm should have went off at 9). Anybody else have this issue? My battery will normally have amazing life. At a concert I filmed for 45 minutes or so and the battery only went down to 73%. But the alarm drains it? BIG issue.

[ImAdrian23]

I'd have tested it, but as my 8X is in service I cannot!
If it's true then it's a horrible bug, but I doubt it. You probably left some 7.5 apps running in the background (they use your battery)

[Squatting Hen]

I use 627.AM for my alarm, not the built in one. I have not had any problems with it. My phone is on the charger at night though.

Maybe this thread: My Lumia 920 made me late for work!

[serdar3500]

I didn't have any programs running aside from the alarm.

[lita_g]

I have a daily alarm set for 6:30am, it doesn't drain the battery. I mean, the battery goes down because of the hours the phone is on, but not anymore than expected.

[HaibaneReki]

I actually charge the phone in the afternoon, by bedtime (around 12am) it's 60-70%, in the morning (8am) less by >5%. I have the Battery level for WP8 app and the usage graph is literally flat during the night :)

I know that with the Li-Ion technology it doesn't matter, but no need to leave it plugged in over night...