Why bowl before bed energizes mind instead of lulling sleep?

I started using the bowl as part of my bedtime routine, but I'm not sure if it's helping. My name is Aditya, DOB March 17, 1993. Sometimes the deep hum lulls me into a peaceful state, but other times, the sound seems to energize my mind, and I end up lying in bed more awake than before. Time: 10:40 PM. Location: Chandigarh. It's a gamble every night. I can't tell if I'm using a relaxation tool or a stimulant right before trying to sleep.