What Comes First - Sleep Problems or the Flare?

New research on the connection between sleep and RA pain confirms what many here know - bad sleep is connected to more pain and good sleep with less pain (see: https://www.clinicalpainadvisor.com/news/bidirectional-link-sleep-pain-rheumatoid-arthritis/).

We know it can be an interconnected spiral. My question is which do you notice first - flare symptoms leading to sleep problems or sleep troubles indicating an on-coming flare?