How to know what specific times my iPhone was being used or if a specific app was being used?

While I was sleeping last night, I had my phone by the left side of my pillow. But when I woke up, my phone was on the other side of the pillow. I want to know if someone picked up my phone and used it and left it on the other side of the pillow. Because if they did, they could have accessed some very private data. I want to know if there's a way to find out if the phone was unlocked during the time I was asleep or if any apps were opened while I was asleep. Is there a way to find out?

btw, i'm still using the iPhone 4

I don't know about seeing what time they were used, but you can open multitasking to see what apps were used last.
Press the home button twice and see what was opened, if you know what you were on last, then you'll know what else was used.
You could have also moved it to the other side of your pillow yourself while you were asleep.

  • Would my crush know that I re-read his texts to me 10 billion times? He always send really cute and sweet texts to me and I re-read them like all the time and I'm paranoid that he might actually know and uh think I'm obsessed with him or something. He has an iphone.
  • When IPhone app isn't launced is my data plan still being used? I have apps like Facebook, Twitter, & Photobucket that I keep logged in so as soon as I launch the app it's where I want it. Is the data plan still in use? What about the iphone Mail app that's kept on as well?
  • Specific Kitchen iPhone App? Hi. On my laptop I use a website called myfridgefood.com where you can check off all the ingredients you have in your kitchen and it generates a list of recipes you can make that you have everything for. I was wondering if there was any kind of iPhone app that does the same thing.
  • Setting/app that automatically turns off your iPhone at specific times? I've been having a bad problem lately of not being able to put my phone down before bed. I keep accidentally staying up till 1:00 am and I need to stop doing that. The problem is even when I use the downtime setting or that dumb clock timer trick it doesn't work cause it's to easy to ignore. I need something that'll turn my phone completely off so I can't use it at all. Anyone know of anything like that?