Day Boy Question:

This could be a tricky one because you don't want to trash your current employer; this will make your interviewer wonder what you would say about them if they hired you. Focus more on the reasons that made you apply for their position instead of dwelling on what you're doing now. Avoid saying that you're bored, or that you're looking for a new challenge; this may make them wonder why you haven't approached your current work about creating new challenges for yourself.