It's no mystery that Generalized Anxiety Disorder can cause trouble falling and staying asleep, as well as feeling tired all the time.

Can GAD in particular cause long, nonrestorative nighttime sleep of 11+ hours and long daytime naps of 1.5+ hours over the course of many years? Nonrestorative means it feels like you never slept upon waking, thereby causing extreme daytime fatigue and exhaustion.

(In the absence of vitamin deficiencies, anemia issues, thyroid issues, sleep disorders, etc.).

I can't find any studies on this. Normally people associate GAD with insomnia, but I'm particularly curious about the length and restorative aspect in those that can fall asleep just fine.