ABOUT A YEAR ago Mika Shibata's youngest son returned to the family home and went wordlessly upstairs. He has yet to emerge from his bedroom. At the age of 26, he sleeps during the day and stays awake at night. His mother feeds and shelters him, hoping he will emerge from this state. But she frets he never will. "The longer this situation continues, the harder it is for him to step back into society," she says.
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