White Noise vs Pink Noise (Versus Brown Noise)
What Is Brown Noise? Benefits and How to Use It for Better Sleep - Dr. Axe
Colors of noise - Wikipedia
White Noise vs. Brown Noise: Which One Is Best for Sleep? - CNET
The Best-Colored Noise To Sleep To, According To Experts
White, Pink, and Brown Noise: What's the difference? – Sound of Sleep
White Noise vs. Brown Noise: Which One Is Best for Sleep? - CNET
What is White Noise vs Pink Noise vs Brown Noise? - The Sleep Store - AU
What Is Brown Noise And Can It Help You Sleep?