Yeah, that can be a problem. Friend/mentor/really cool lady Pat Giff says we should keep making the problem (conflict) worse for the main character during this time. That has helped me a lot to get through those pesky long middles.
Me? I'm no fan of the denouement, the very very end of the story where everything wraps up. According to this source, which is not wikipedia,* "Denouement is usually the final scene or chapter in which any necessary, and, as yet unmade, clarifications are made. The word is taken directly from French and means literally 'untying.' The French nouer is from the Latin nodare which was derived from nodus, meaning 'knot to untie.'"
|Look! A graph! Or is it a chart? Or a map? ::shrugs:: I'll stick to writing.|
What's that? You're worried because I seem to have completely abandoned Hazel? Oh, on the contrary. She has some big news coming up in less than a month. But it's a secret so you will have to wait.
*Although they have a great breakdown of dramatic structure even though they are The Evil W.
**But I do LOVE to say "denouement" because it makes me feel really really smart.
***Not really. She is actually very nice.
****Because The Ending Fairy came!
*****And by DONE, I mean MOSTLY done. She still needs a good going through/editing, but that's different and way easier.