Disambiguation (1, 2 and 3) at advaitin between shridakshinamurthy stotram, that begins with "vishwam darpana drishya maana nagari tulyam" and others. It seems that there are three stotras by Shankara on Dakshinamurthy and the convention seems to be to call the most popular one (one that begins with "vishwam") as ShriDakshinamurthy Stotram. It is erroneously called astakam, as it obviously does not have eight shlokas.
Shri Subramanian continues his exposition of the ShriDakshinamurthy Stotram. In part VIII, he comments on verse 7 of the stotra.
bAlyaadhiShvapi jAgradaadiShu tathA sarvAsvavasthAsvapi
vyAvR^ittaasvanuvartamaanamahamityantaH-sphurantam sadaa |
svAtmaanam prakaTIkaroti bhajatAm yo mudrayaa bhadrayaa
tasmai shrIgurumurtaye nama idam shrIdakShiNAmUrtaye || 7 ||
Here are Part VIII-a, Part VIII-b, Part VIII-c, Part VIII-d, Part VIII-e and Part VIII-f.
There is a mistake in numbering VIII-e as VIII-f. Here is a supplementary comment on the word 'dhira' VIII-d dhira.
Link to previous ones.
Prof. VK's page on Shri Dakshinamurthy stotram.