NEW YORK, May 27: A new study based on pairs of Canadian twins suggests that genetics play a strong role in how long kids sleep at night, but their environment may be more important for afternoon naps. Researchers compared sleep patterns for close to 500 sets of identical or fraternal twins. They found that especially as kids got older, environmental influences – which include when parents put kids in bed, for example – explained more and more of their napping differences. (AGENCIES)
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