Sleep experts advise that any blue light emitting devices -- smartphones, laptops and televisions, to name a few -- be put away 45 minutes to an hour before bed.

睡眠专家建议， 任何发出蓝光的设备——智能手机、笔记本电脑和电视，仅举几例——在睡前 45 分钟到 1 小时内收起来。