如果长期熬夜，心血管疾病可是隐形杀手。

心血管疾病

根据世界卫生组织（WHO）数据显示，心血管疾病是我国的头号杀手，在2014年我国的死亡人数为14万6000人，其中因心血管疾病死亡的比率佔了36%。

美国哈佛大学，在一项女性流行病学研究中针对70000名45至65岁的女性进行测试，发现睡眠时间过短将不利于心脏健康，与每天睡8个小时的人相比，若每晚睡眠时间低于5个小时，增加心脏病机率会高达40%。

为何？熬夜时人容易处于紧张状态，得不到放松，而造成血管收缩异常，血压比正常人高，因而容易诱发高血压。所以熬夜正是诱发心血管疾病的原因之一。

由此可见若经常熬夜，不但会患上心血管疾病，还会间接导致猝死。因为熬夜猝死的人，大多数死于突发的心脏病。其原因是熬夜导致生物钟紊乱，交感神经过度兴奋，使心跳加速，引发室速、室颤，造成心源性猝死。

然而，熬夜并非猝死的根源所在，只有那些已经出现心血管症状或者有心血管疾病家族史的人，才容易因熬夜导致猝死，有猝死家族史的人更是熬夜猝死的高危险群体。

Cardiovascular diseases

According to the data by World Health Organization (WHO) ，cardiovascular disease is number 1 killer in Malaysia. In 2014, the number of deaths in Malaysia was 146,000, among which cardiovascular disease accounted for 36%.

Harvard University conducted a research on epidemiology on 70，000 women aged 45-65 and found that lack of sleep is detrimental to the heart. 40% of the people with less than 5 hours of sleep are likely to suffer heart diseases compared with those who sleep 8 hours a day. This is because people who stay up late will feel tense easily. They are unable to relax, resulting in high blood pressure. So, staying up late is one of the causes of cardiovascular diseases which indirectly leads to sudden death.

However, staying up late is not the root of sudden death. People who show cardiovascular symptoms or have a family history of cardiovascular disease are the high risk groups and are liable to experience sudden death if they stay up late too often.