Ah yes white noise. Years ago I needed complete quiet to get my sleep however then the slightest noise would wake me up depending on what level of sleep I’m at. I sleep best with an AC on, I can do a fan but if it’s an oscillating fan it would wake me up. I’ve tried soft music, and binaural beats however if the tempo changes it tends to wake me up. I like the steady rhythm of noise. That works best for me.
Once the room where I’m sleeping is chilly cold, I’m definitely going to fall asleep a lot quicker. Ever since I learnt it, I always on my room AC for about 30 minutes before entering the room to sleep. As for noise, I enjoy playing music in room’s background when I’m sleeping.