《老友》专家门诊:在现实生活中常有“睡死”现象,让人不可思议。死者当中的多数人都身体较好,平常没什么明显病症,且生活都比较正常,殊不知一觉睡下,第二天却死了。请问:这种“猝死”有没有可察觉的征兆?有什么方法可以预防? “Friends” expert clinic: In real life often “sleeping ” phenomenon, people incredible. Most of the dead are in good health, with no obvious illness and normal life. They sleep without knowing it and die the next day. Excuse me: Is there any detectable sign of such “sudden death” and what measures can be taken to prevent it?