it depends on what ICO(s) that you are invested in
i'm not a financial advisor or an expert on market, my comment solely based on my experiences, so still before you invest on an ICO, do your own research
before i'm invested on an ico, usually i read their whitepaper, what's their goals in the future, and why do they make that project, and does that project could solve the problem that exists in our society right now. and also take a look at the team behind the project.
and last but not least, i always follow my heart to invest on it or not, but without ignoring my logic
be healthy