美国睡眠医学会建议健康的成人午睡时间应限制在20-30分钟内，事关短暂午睡可以提高日间的警觉性和表现。但30分钟或更长的午睡时间、日间午睡时长欠规律都可能会导致人在醒来后感到昏昏沉沉，这种“睡眠惯性”会延迟午睡带来的短期表现效益，扰乱身体的自然节奏。

MOGADISHU, June 12 (Xinhua) -- The International Committee of the Red Cross (ICRC) on Thursday warned of a surge in severe malnutrition among children across Somalia, with health facilities it ...

Aviation authorities have found one of the two black boxes of the Air India flight that crashed in the western Indian state ...