Flex-time dilemma

We have an agreement for our working hours. It is because of our situation, we are students, so we have to do with our studies.

Anyway, some of our employees have flexible schedule, so they can woke up late, and work overnight. This looks cool to somebody who works at formal company – but the thing is, it's not that convenient. We also have strict rules for our project due, and team meeting (except me,) and the other schedule, but we cannot control each other's time schedule.

It's good to be free, but we have to control for it. And it is even harder to being passive.