Sequels!

 As I work through my second draft, I can’t help but think about potential ideas for a sequel of my current WIP. Is this something anyone else does? I am not sure if it is a wise thing to do as obviously I haven’t even finished book number one, I have no idea how it is going to be received by potential agents and it may never even be published. Therefore, should I even be wasting my time with daydreams of a sequel? It has got me wondering, should I tie everything up neatly in this draft or should I leave a few things loose with prospects of a second book. Could I leave enough mystery so that it holds possibility for a continuation but not too much mystery so that if there never is a follow-up, it doesn’t destroy the story too much, or leave too many things unanswered?

Let me know your thoughts. Do you ever find thoughts straying to potential sequels as you write? Do you already start writing with sequels in mind, potentially even already plotted and planned? Or do you just purposely write for a one-off and then consider any sequel ideas later?