Same with me. Things were 100% fine when I was on iOS 6 and never had this problem before. Updated to iOS 7 and the minute I did, my sleep button started taking multiple times of clicking to wake/sleep my phone.
Same here. Absolutely no problem with the sleep button before upgrading my iPhone 5 from iOS6 to iOS7, but after upgrading, it takes me anywhere from 1-5+ clicks. The home button does not have a problem (if I use it to 'wake up'), but the sleep button works intermittently to wake or sleep the iPhone.
If I wasn't me I would think that its hardware only and that the problem probably existed before the iOS7 upgrade... but I never noticed it before and it was terribly annoying from the moment iOS7 was installed. I noticed someone recommending to push on the left of the sleep button (if you're looking at the screen) and that seems to make the button work 90% of the time, which again points toward hardware... but I NEVER had this problem before upgrading to iOS7.
I don't have an Apple store in my city, but I'm going to try to get to one in the next few days and try for a replacement. Without AppleCare, I'm not expecting much... has anyone without AppleCare received a replacement?