[temp43t453]

maybe your brain arent tired enough. or maybe you couldnt go to sleep due to low frequency city hum that decreases only around 2am at your place

[WarOnPrivacy]

We're suburban/rural. All housing except for an ALF and a mega supermarket 1k ft away.

Also bedroom is interior w/o windows, noise resistant.

Supermarket's schedule changed with the pandemic. Hum from there should have changed with it.

Really interesting line of thought tho.