Interesting. I may need to add some sensors.

I spend time in two places. San Juan Islands WA and Santa Cruz, CA.

On island, nights are too quiet. During the day, a float plane a mile away sounds like it is next door.

In Santa Cruz, the house is on a major street. Busses, ambulances all sorts of yahoos.

I sleep better quiet. But I sleep even better when settled - mind not going, etc.

I generally don’t sleep well at all. The biggest factor is - has my brain settled. Background and noise don’t matter.

I recently had (and then lost/left on a plane!) a Lumenate Nova[1] and found it was very helpful at quickly getting me away from the mind going state. I work very late to overlap with distant timezones and would often find it difficult to get to sleep once I went to bed given I've been staring at screens and on calls only minutes before hitting the pillow. This was great.

[1] https://lumenate.co/lumenate-nova/

I find if I work out consistently I am always getting great sleep and getting really tired in the evening, but if I don't I might not ever feel tired then I look up and it's 3am. I never made the connection between heavy exercise and sleep before, but it seems obvious in hindsight. Got to do what we are built to do not what modern life insists we do.

“Has my brain settled” I feel this.

I started meditating recently (~10mins per day) and have found it to be surprisingly effective. It’s a combination of body scanning & mindfulness meditation.

It doesn’t always help, but tends to.