What does "just" mean here?
"Just" has several different meanings depending on the context it is used in. In this context, it means possibly or perhaps. Marlin is asking Nemo if they can possibly go back to sleep. Here are some more examples of "just" being used in the same context. Ex: Can you please just listen to me? Ex: I need you to just stay here for one minute while I go inside. Ex: Just tell me what I need to do.