I often listen to white noise or more recently brown noise. It helps me get back off to sleep.
Brown noise is a deep, rumbling sound that has more power in lower frequencies, making it sound like a waterfall, heavy rainfall, or a strong wind. Unlike white noise, which has equal volumes across all frequencies and can sound harsh, brown noise lowers the volume of higher frequencies, resulting in a more soothing and balanced audio experience. Many people find it relaxing and use it to help them sleep, focus, or block out distracting noises.