Nightshade (2022) on Netflix

Plot summary

Detective Beckett and Ben Hays are getting nowhere with the murder of Randy Bell. Ben cannot sleep, and nothing he has tried has helped him. He goes to see the psychiatrist Dr. Collins, who persuades him to try hypnotherapy. His sessions go on while the killings do too, and he begins sleepwalking at night and having nightmares that echo the crimes. Explaining his nights to his wife, Lucy, and to Beckett, who notices that something is wrong with him, is not easy. Tired and desperate, Ben wants to know what is causing his condition, who the killer is and what connects him to the victims.