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Sleep timing, nighttime awakenings, and morning alertness are common markers to monitor.

10.1002/jnr.23214 [DOI] [PMC free article] [PubMed] [Google Scholar] Appleyard S

Others believe that nootropic supplements indeed improve cognitive functions and boost mental alertness to some extent

Absorbance was measured at 540 nm, using sodium nitrite solution as a standard
