In the usually insomnia group, the edge weights between “PHQ9–4-GAD7–2 (Energy–Uncontrollable worry)”, “PHQ9–4-GAD7–4 (Energy–Trouble relaxing)”, “PHQ9–4-CRP (Energy–CRP)”, and “PHQ9–5-CRP (Appetite–CRP)” were significantly higher than in the group that never/rarely experienced insomnia. Here, CRP is linked to insomnia.