when you wake up, reach over and turn your machine off then back on. this will cause a "break" in the graphs. if this matches up with your leak rate, then you'll know for sure.
btw, could i get you to start using the quote feature? when you read this message(any messgae, really) you'll see in the upper right hand corner a ! and a ". hit the " to reply to this and it will quote what my message says.
this helps keep the conversation from getting confusing. it also has the benefit of notifying me that you have replied to me.