Not really. They tweeted about sleep paralysis demons the day prior to the announcement and 12 days after the announcement with no indication they were related.
It's important to remember that the Nightingales are not demons, they do not have the ability to paralyze their victims (they used medication in Blood Prey, which they won't have in Blood Pit), and do not attack when their victims are sleeping.
In other words: Nightingales do not relate.