It happened too me as well. My iPhone 5 went back to sleep when I tried to swipe the lock screen and never woke up (until I reboot it). I also lost the click sounds (lock and keyboard) and I had to turn them off them back on in settings.What a coincidence, it just happened again.
Woke my phone up, put in the first digit of my pass code and it froze. All I was able to do is put it back to sleep, it made the lock sound.
Then it stays asleep. I had to hold the power and home buttons to restart the phone.
I hope the update comes really soon.
I have looked into this issue myself after having numerous freezing issues and found this linkSometimes my iPhone won't wake up from sleep. I have to hold the power and home button to force restart it. Anyone's else doing this?