Many people complain of increased pain in the evening and during the night, regardless of the cause of the pain. Often, this is because during the day, we are busy with lots of things to distract our brains fromt he pain signals the nerves are sending. When we settle down to relax, or get into bed to sleep, those distractions are gone and our brains can focus on those nerve signals more clearly.
Anyone having enough pain to disrupt their sleep should address appropriate Pain Mgmt with their Docs. Even those who do currently take pin meds may still be deprived of a decent ngiht's sleep if the meds are short acting and are wearing off in the middle of the night. Sure, something like Vicodin can work very well, but wears off between 4 and 6 hours after taking it.
While discussing sleep disturbances with my Mom's Pulmonologist, he actually recommended that I also have a sleep study done to determine the efffectiveness of my Pain Mgmt. Apparently, not only can they evaluate for sleep apnea and the like, but there are specific brain waves which indicate if sleep deprivation is related to pain. I haven't seriously considered doing that, but if my inability to sleep a full night lasts much longer, I may just sign myself up for it.