What about running these statistics (correlating decisions with day of week, hour of day, etc.) for each judge, and then just tell them: see, in the past year you acted in this not very bright way; maybe you should think about the way you do your job? And, by the way, we'll keep running these statistics on how you judge.

Being made aware of our own biases is often the most effective way to make the situation better.

Could be but statistics are tricky.

Hour of day / day of week can easily be skewed by the system at large.

For example more bar fights over the weekends, more violent crime during the heat waves in the summer, more prank crimes involving young first time offenders during school breaks (e.g. spring break), more cases of spousal abuse during the holiday season etc.

Just having the numbers and saying here you are biased isn't really easy because it might not be possible to actually determine true bias from them.

That's true, mine was an oversimplification and the numbers would require more analysis; it would be a worthwhile analysis nonetheless, IMO.

Make judges reconfirm sentences 14 days after the initial sentencing.

What about judges too stubborn to admit they were wrong?

Difficult - and adding to workloads is problematic.

I'm not sure what good psychiatric counseling would do? "Oh you had a fight with your spouse last night? You better take a day or two off."

Alleviate the psychological pressure that comes from being a judge.

Provide an evaluation as to their ability to preside over a case.

You can think of plenty of other examples where therapy and counseling might be quite good, i rather not have judges secretly medicating themselves with antidepressants, and judging by statistics alone probably more than a handful of them do.