Earlier quoted context omitted.
I'm pretty sure all things you experience in this world can "directly biochemically alter the body". This isn't all that pedantic a point either. Your body directly produces neurochemicals from sense data, and, that includes the photons bouncing off of a like button, the particular movement of a scrolling finger, or the sonic vibration of a phone notification. It wasn't so long ago that people balked at food addictio…
I mean there is the introduction of a chemical into the blood stream that acts on neurons. This does not happen with screens and speakers.
From what I know this is not explained by just sleep deprivation. So here we have no direct chemical transfer altering the physiological state of a man via external stimulus.
So if a baby can chemically alter a father, why can't highly stimulating lights and sounds?
Many years back I had a pretty strong detox from smartphones and videogames lasting about 2 years. When I first played a mobile game, I was so stimulated by it I found it hard to sleep properly for the first few weeks of playing. Later on my brain adjusted but now I probably have some kind of habitual need for dopamine...