Lots of things actually. Do you have more sessions going through the data plane for some reason, did someone install something that is chatting to another zone, are people streaming more media, software bug? I think the first thing to look at would be if your session count is higher than it normally is and go from there.
If you have reports for application statistics along with sorting by the number of sessions then you can somewhat monitor the number of sessions on your network. I've included a screenshot of how I have mine setup. To the best of my knowledge you can't have a report for the number of sessions. We use the API to pull the output and save it to a text document so that we can somewhat manuanually monitor it if needed.
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