I'm convinced some of y'all are slow and can't adjust the settings on your phone to use it properly.
I have S3 on Sprint and the signal in my apartment is piss poor and even roams sometimes and I still don't lose more than 20% of battery while I'm sleep (7-8 hrs)..ever.
Turn off your wi-fi when you're bout to go to sleep, and adjust the settings on how often your phone searches for FB/weather/twitter/etc and you should be good. Idk wth y'all doing but, y'all obviously are doing it wrong
For the record, last night I went to sleep at 2:30 with 16%, woke up at 10:30 and my phone was still on...
battery life on ANY PHONE depends on any number of factors such as wifi / no wifi, screen brightness, 4G, app use, CARRIER, cell signal at any one spot, part of the country, part of a town, age of battery, etc.
the only reliable way to compare battery life is to take 2 brand new phones and put them side by side in the same room with the same apps on the same carrier and start your engines . . .