Yui Matusmoto, 4, plays with a digital duck toy, in the living room of his home in Tokyo.
Yui Matusmoto, 4, plays with a digital duck toy, in the living room of his home in Tokyo. Yuri Kageyama AP
Yui Matusmoto, 4, plays with a digital duck toy, in the living room of his home in Tokyo. Yuri Kageyama AP

Smartphones might equal sleep trouble for children

November 02, 2016 08:43 AM