Sleep quality problems three decades post-disaster

Sleep quality problems are a core feature of posttraumatic stress disorder (PTSD). The aims of this study were to describe and evaluate possible differences regarding sleep quality problems and hyperarousal symptoms between exposed and unexposed survivors after an avalanche. Further, we wanted to describe any association between avalanche exposure and survivors' self-reported sleep quality problems and posttraumatic stress (disorder) symptoms with and without hyperarousal symptoms.

The participants were soldiers who had survived an avalanche (n = 12) and a sample of unexposed soldiers (n = 9). Subjective sleep quality problems and posttraumatic stress (disorder) symptoms were assessed using well-validated measures: Pittsburgh Sleep Quality Index (PSQI), Posttraumatic Symptom Scale-10 (PTSS-10), and Impact of Event Scale-15 (IES-15). Hyperarousal symptoms were assessed using a 3-item hyperarousal-index from PTSS-10 (PTSS-10/Hyp index).

No significant difference in sleep quality problems was revealed between the exposed and unexposed groups. There was a significant association between those with PTSS-10 ≥ 4 combined with hyperarousal symptoms and sleep quality problems (p = .046), 30 years after the avalanche. Likewise, no significant associations was revaled between those with sleep quality problems and IES-15 ≥ 26 with and without hyperarousal. Binary logistic regression showed that those with sleep quality problems (PSQI > 5) 30 years post-disaster, had 2.5 times greater odds (OR = 2.49, 95%CI [0.95-6.55], p = .064) of having hyperarousal symptoms during the whole follow-up period compared to those without sleep quality problems.

Our findings may indicate an association between sleep quality problems (PSQI > 5) and hyperarousal symptoms in soldiers with scores above cut-off point for posttraumatic stress (disorder) symptoms.