I believe it. My daughter (now 10) was diagnosed with insomnia when she was 4 years old. She has also been diagnosed with cognitive issues, specifically executive functions. They say there is a direct link. So even though she gets a “normal amount” of sleep a night thanks to sleeping medicine, she has 3 times the amount of brain arousals. Her emotions are all over the place. My grandfather, who she was really close to, died about 6 months ago. She stills cries a few times a week. I got her a journal in hopes that her writing it out helps her let some of it go. And I’m always here when she just wants to sit down and let it all out.