Yes, when I was using beeminder, I both set scheduled breaks and also got hit and got a break. I'd say the issue would be 50/50 planned/unplanned, but I didn't always plan appropriately so I got hit more often than scheduled.

I did use beeminder for 3-4 months at a time, with great benefit! But looking back at every goal I set, it starts slipping past the 3-4 month mark. I got similar results with other systems (like the Lights spreadsheet from ultraworking or keeping a journal in text files), although without the nice beeminder charts..

I'm not sure, do other people see these patterns with their goals? Are there any tricks for fighting this late slippage?