Does turning off WiFi stop 3GS battery drain?

Hi All
This question is NOT directed at those who can't make phone calls for more than 5/10 mins (although I was once that man).
I have had problems with waking up in the morning to a randomly dead iPhone, even though battery was at least at 50% before going to bed. However, whenever I turn off WiFi before going to bed I wake up to my iPhone only having lost around 10% battery.
So, my question is, could people with the same problem as me please try turning off their iPhone's WiFi before going to bed and see what happens?
I would be interested in the results.
Thanks
PS. Please no 'Have you tried...' posts as the answer is 'Yes, I have!'

Hi BigBex,
My wife is currently using my iphone and in the last couple of weeks, I have noticed that when ever I go to use it, the battery is very low.
This phone sits in her handbag most of the time not being used, but the battery was still 80% down within the day.
I turned off WiFi a few days ago and the battery seems to settled have down and has only used about 25% per day.
I intend to have a much closer look over the next weekend to see if I can determine what may be causing the drain.

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Does turning off WiFi stop 3GS battery drain?

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