Q:

What to do with otherwise good questions that seem a bit too broad? 

I've been reading a lot of questions on this site and thinking about the concept of optimal question scope. 
Questions in the cognitive sciences can often be substantially narrowed:

What type of people (children, adults, older adults, people in a particular category, disorder, etc.) 
What type of task (either in terms of a specific task or a domain of tasks)
What context (applied, experimental, etc.) 
etc.  

Thus, what should we do with otherwise good questions that seem a a bit too broad in their scope? 
UPDATE:

I've added a separate question on the issue of what makes good scope so that this question can focus on how to deal with existing questions that seem too broad. 

A:

I think the best course of action here should be to communicate with the users and help them narrow down what they're asking about. 
This is especially important during the beta; we need to really help new users understand how to ask good, targeted questions.  As time goes on and the site gets more established we can consider a jump to just closing broad questions and asking the OP to edit and flag for reopening. 
I would suggest commenting on the user and asking them to narrow down the question.  If they are unclear as to how, direct them to chat and see if we can help them there. 
Ultimately, if the users are unwilling or unable to narrow down the question, then the questions remain bad questions (or are just inherently bad questions, like my question on sleep was) and they should be closed if they are not improved.