Dave has Post Traumatic Stress Disorder.
Among other things, it makes him hypersensitive to certain frequencies.
The frequencies trigger PTSD symptoms.
So Dave sleeps in an insulated steel chamber
about five feet wide by six feet long by four feet high.
The walls are five inches thick.
“But bass sounds still get through.
Bass penetrates just about everything.”
The sound-proof chamber is in the back of Dave’s Ford van.
As soon as his workweek is done, he heads for wilderness areas
where things are far more quiet and thumping bass is rare.
“I can sleep about four hours straight out here,” he says, happily.