Mikayla D. M. Joslin

Insomnia symptom severity predicts blunted cortisol reactivity to a psychosocial stressor.

Insomnia is characterized by a state of hyperarousal, sometimes seen as increases in hypothalamic-pituitary-adrenal (HPA) axis activity (e.g., greater cortisol secretion). The evidence for the association between insomnia symptoms and HPA-axis functioning, however, is surprisingly mixed. Moreover, few studies have inve...