I understand Tukey's HSD is the most common post-hoc test for between-groups ANOVA. It appears some do not recommend or select it as a post-hoc test for within-groups ANOVA. Instead, they prefer Bonferroni test or Sidak test. But, both of those seem to just multiply whatever p-value you would get from a paired t-test by the number of hypotheses you are testing. This approach seems less than robust. Instead, if I could I would rather use Tukey's HSD test in this situation [within-groups ANOVA]. Could I do that? Or are there specific reasons not to.