Good sleep - the thing Mom worries most about

Author: Xue Runyuan
Publisher:
Publish Date: 2006-01-01
Features: Dongdong woke up in a hurry. He realized he was sleeping in bed. Dongdong rolled out of bed and rushed to the bathroom. It was time for Dongdong to get up when it was bright. Do you know these sleep-related facts? Children need to sleep for 10 to 12 hours every day. When people are sound asleep, they breathe once every 3 to 4 seconds. Every night...