Then you shouldn't be writing an article about sleep as if you were an expert. Why on Earth should I trust anything this man says if the first line of the article is about how he's not qualified to give the advice he's giving?
He's a qualified practising psychiatrist. When he says "I am not a sleep specialist" he means it in the same way your mechanic means he's not a Toyota specialist.
I sort of got past that, but later in the piece author gives a "parsimonious theory" of why Melatonin makes people wake up early, I just closed the tab, they were basically just guessing
Then you shouldn't be writing an article about sleep as if you were an expert. Why on Earth should I trust anything this man says if the first line of the article is about how he's not qualified to give the advice he's giving?