Increased use of melatonin for sleep problems in children is one surprising finding of a health survey, reports Reuters Health.

The increase in children’s use of yoga and melatonin was a surprise to Dr. Josephine Briggs, director of the National Center for Complementary and Integrative Health (NCCIH).

“The changes in the yoga category are very large,” she told Reuters Health. “I was also struck by the use of melatonin in children.”