BDNF and post-traumatic stress disorder: Exceptions included caspase-1 with PSQI-A: Trauma NM (ρ = 0.39, p = 0.038), reflecting a potential link between inflammation and trauma-related nightmares even in the absence of PTSD, and BDNF with PSQI-A: Trauma NM (ρ = 0.41, p = 0.029), indicating that neurotrophic activity may influence trauma-related sleep disturbances.