Toying with Google Apps Script

Google offers an access to its services with Apps Scripts (JavaScript). That gives you a possibility to connect your spreadsheet to a fascinating variety of tools like geocoder, stock info, language translator, or email.

My java-scripting abilities are rather limited but just playing with tutorial examples I was quickly able to produce a script analyzing time distribution of received emails. It looks through your Gmail for the given contact and record the times of emails sent by it.

So this is email behaviour of my wife. You can see a peak at the noon when babies are having a nap and another local maximum at the end of the day when they are finally sleeping in beds.