School can certainly influence the amount of lucid dreams you have, the amount of dreams I write down and amount of lucid dreams I have during hectic school weeks or just other stressful events are drastically decreased, sometimes I forget about writing them down all together.
It is important that lucid dreaming is always somewhere in the back of your mind, but stressful events seem to push it out because it causes you to worry about other things, which are probably more important at that time.

So I think to counter it and still have lucid dreams you should try to focus more on lucid dreaming, keep writing you dreams down and keep performing reality checks as much as you can OR you should (like I do most of the time) just leave lucid dreaming for a short while until things cool down.