You could likely better understand this by looking at electricity consumption data. i.e. people use less electricity when they are asleep. I know a lot of this

You could likely better understand this by looking at electricity consumption data. i.e. people use less electricity when they are asleep. I know a lot of this data is publicly available for the UK (http://www.gridwatch.templar.co.uk/index.php http://www.gridwatch.templar.co.uk/index.php). Presumably you could get something similar for the USA, perhaps via https://www.smartgrid.gov/ https://www.smartgrid.gov/