I have never heard of it before, but it should be relatively easy to build one.
Some ideas might be an RC circuit build around a 555 timer. Each time it goes off, you press a button to charge the capacitor to a random voltage.
If you own a pager, you could write a computer program to page it at random intervals.
If you own a cell phone, you could write a program to call you at different times during the day.
I find it to be just as effective to pick events that I do at random times during the day such as bathroom breaks or answering the telephone and to do reality checks when those events occur.




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