Comparative characteristics of insomnia with normal and short sleep duration (after Vgontzas 2013).[11] ISSD: insomnia with short sleep duration; INSD: insomnia with normal sleep duration; CBT-I: cognitive-behavioral therapy for insomnia. Arrows indicate increased or decreased risk of the respective phenomenon in one of the phenotypes compared to the other.

 
 
  Part of: Georgiev T, Draganova A, Avramov K, Terziyski K (2025) Chronic insomnia – beyond the symptom of insufficient sleep. Folia Medica 67(3): e151493. https://doi.org/10.3897/folmed.67.e151493