Gardner says teens diagnosed with ADHD report symptom relief after 48–72 hours in dark

What was said

"It's interesting when you put teenagers in the dark for a couple days, you take teenagers teenagers who have been diagnosed with ADD or ADHD, you put them in the dark for 48 hours or 72 hours. When they come out, they're like, I don't have ADHD. I just need to get off my phone for a while."

Gardner claims that teenagers diagnosed with ADD/ADHD who spend 48–72 hours in darkness sometimes report they “don’t have ADHD” and attribute improved focus to time away from phones. He offers the account as an anecdote while arguing that modern overstimulation affects attention, without describing any study design, sample size, or clinical assessment.