Look at this picture, it shows a little boy sleeping on his mother. But can you recognize the "big red flag"?
The little guy was considered naughty and was believed to suffer from ADHD, as is so often the case nowadays.
But his questioning mother read something, and what she found throws a whole new light on this image.
It's his mouth, it's open. He breathes through his mouth while he sleeps.
Melody Yazdani has shared her little boy's photo in the hope that it will help thousands of other parents whose children have behavioral problems.
She posted the photo of her sleeping son on Facebook on October 24 and told her parents they were "changing their lives."
She wrote, "All parents, if you have a child, I'll tell you something you need to know, which you've probably never heard before.
"The picture I share with this story has a big red flag on it, do you see it?"
The mother explained how her son Kian, who is now eight years old, started to receive behavioral reports at school last year.
He had no problems at kindergarten and was always "intelligent, lively and extremely active", so Melody was surprised when Kian's teacher told her that he was pushing other children and "can not do much to control his body".
His behavior improved with new systems at school – but things got worse at home with the collapse of small things.
"Every morning it's rage before we even get up," she said. "Beating and throwing things and screaming … All screaming … Starting every morning at 5 o'clock.
"We were at a loss – how did he become like that, what could we have done differently?"
The Mirror reports how Kian saw a therapist who recommended ADHD testing.
"Lightning Strike" struck when Melody found an article linking ADHD to sleep disorders and mouth breathing.
The red flag on Melody's photo shows that Kian's mouth is open while he is sleeping.
She wrote: "CHILDREN SHOULD NOT BREATHE BY YOUR MOUTHS, not while awake, not asleep.
"Oral breathing is NOT NORMAL and has long-term consequences for your health, I repeat because it is important – MOUTHALISM IS NOT NORMAL DURING THE DAY OR AT NIGHT.
"When a child breathes through the mouth, their brains (and their bodies) do not get enough oxygen, and at night, this reduced oxygen saturation is detrimental to the quality of sleep and the ability of the brain to find enough peace."
Melody lists other problems that can be caused by mouth breathing before declaring that sleep deprivation in children and ADHD "have the same symptoms".
She claims that studies on ADHD medications that address respiratory distress in sleep disorders have shown an improvement in symptoms, and within six months, 70% of children had not been treated with medication.
"Like in, her ADHD was cured because it was not ADHD in 70% of the kids." Let that in, "she wrote.
Kian was diagnosed with sleep apnea and sinusitis.
"He got exactly 0 minutes of REM sleep and low oxygen saturation during the first study, and his sinuses were 90% blocked," Melody said.
"We had no idea that Kian had a headache every day, but it was just his normal, so he never thought to tell us."
The mother noticed an "immediate change" when Kian's tonsils and adenoids were removed and breathed through his nose as he left the operation.
"We have seen a complete 180 behavior (sic)," she wrote. "No more angry tantrums, no fixation on small OCD things anymore, it was a huge change.
"I'll tell you why I'm telling this: Nobody ever told me about it in my 12 years of education.
"All signs were right in front of our eyes and I had no idea."
You can read Melody's full post here.