"Off" weeks

I have been reading a lot lately about “off” weeks on the site in which gear is still being used at very low dosages primarily in the AM only. I think Patterson even mentioned that while using Androsol/Nandrosol he continued using 7-14 sprays during his “off” weeks. Can anyone give a little more detail as to the pros and cons of continuing usage of gear or pro-hormones during the “off” weeks of a cycle. I thought that off meant off.

Is there any benefit of using Nandrosol for 7-14 sprays a day (in the AM only) during the “off” weeks as opposed to just being clean for the recommended 4 weeks. Thanks.