I have a Google Nexus 7 2013 model, and foolishly, I never password protected the home screen. Today I left it somewhere and now I am worried someone has looked at it, because it contains some very sensitive information. Is there any way I can find out if it had been ''woken up' in the period I had left it, and preferably, which apps had been used? I should add that it was switched on all the time it was left on its own, as it has a case that turns off the screen when it's closed. Thanks.