Samsung Galaxy SII insane battery depletion advice

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http://androidforums.com – Hi I just recharged my Samsung Galaxy S2 last night before I went to bed and haven't used it. The next morning after 7 hours I check the battery and it's already on 72%. Is that normal? I mean how can it lose 28% in just 7-8 hours? Are there any specific sort of apps or services that might consume so much energy? And are there some apps that might help saving energy? I heard that ICS uses more energy than Gingerbread but I don't know if it's true. Can anyone help please? P.S. Data transfer (3G) was enabled, but the phone was just idle. Could it really be possible that my phone someh (General)