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Instead of feeling crisp and refreshed, Jesse Wu wakes up sluggish after 12 hours of sleep.
Many people will tell you, they sleep a little worse when they sleep a long time on weekends. Too much long sleep on weekends does not seem to make people feel better. But the reasons haven't been determined.
For years, doctors have warned about the dangers of not getting enough shuteye -- traffic accidents, weight gain, decreased productivity and immune protection, but the effects of oversleeping are not well-understood. There isn't medical evidence to recommend that people who sleep long hours should change their habits, Kripke said.
Daylight saving time ends this Sunday, giving sleepers a bonus hour of sleep.
Many professionals sleep little on the weekdays （about five hours） and make up for it on weekends, spending eight to 12 hours blissfully hibernating. Sometimes, after a long stretch, they wake up too tired to function.
This is known as sleep drunkenness, when a person hovers between sleep and wakefulness. In one case, a patient who had sleep drunkenness came to the emergency room because his wife thought he had a stroke.
Oversleeping once in a while doesn't present serious health risks, experts say.
But if you habitually sleep excessively, it could be the result of an underlying health problem. And it could be cutting into your life span.
A 2007 Finnish study found that the mortality risks increased by about 20 percent for people who slept more than eight hours. That same year, a British study found that people who slept five hours or less and those who slept more than eight hours also faced increased risks. Another study showed that people who routinely slept more than eight hours a night had a greater chance of stroke than others with less sleep.
Scientists say sleep and longevity are somehow associated, but there might be confounding factors.
Here are possible factors for habitually excessive sleep, known as hypersomnia:
Problem: Poor-quality sleep
A person could sleep the recommended amount, but still feel tired because he or she got poor quality sleep.
The average sleep cycle takes 90 minutes to complete. It starts from stage 1, the lightest sleep, and progresses to deeper levels through stage 4. Then, it continues to rapid eye movement （REM） sleep when the person dreams.
Problem: Other medical conditions
Sleep apnea is a major cause of problems, when breathing stops during sleep.
Another possibility is periodic limb movement disorder, which causes a person to jerk and twitch during sleep, causing disruptions. Depression has also been associated with excessive sleep.
代替了每天能感覺(jué)到的新鮮活力，Jesse Wu 在沉睡了12個(gè)小時(shí)后醒來(lái)。
許多人會(huì)告訴你，他們睡眠質(zhì)量不好，或者他們?cè)谥苣┧荛L(zhǎng)的時(shí)間。在周末更多的睡覺(jué)并不代表，他們就睡的多好。但是原因究竟是什么，還沒(méi)有人確定。
許多年來(lái)，醫(yī)生們一直在警告瞌睡帶來(lái)的災(zāi)難-交通事故，肥胖，免疫力下降，但是多余的睡眠并沒(méi)有起到多大的幫助。并沒(méi)有醫(yī)學(xué)證據(jù)顯示，人們?cè)黾铀邥r(shí)間，就可以改變他們的生活習(xí)慣。Kripke說(shuō)。
在這個(gè)星期天，增加足夠的睡眠？
許多工作人員在工作日里睡眠及少（包括在5個(gè)小時(shí)之內(nèi)）然后他們通常會(huì)在星期天補(bǔ)回來(lái)，在星期天花上8到12個(gè)小時(shí)睡覺(jué)，但在他們經(jīng)過(guò)長(zhǎng)時(shí)間的睡眠之后，他們會(huì)感覺(jué)更加疲倦。
這就被稱(chēng)為睡眠醉酒癥，當(dāng)一個(gè)人經(jīng)常在睡眠和勞累中徘徊的時(shí)候，就會(huì)產(chǎn)生如此疾病。有一個(gè)案例，一個(gè)病人被他的妻子送來(lái)急救病房，醫(yī)生查出他是應(yīng)為睡眠醉酒癥而引發(fā)的中風(fēng)。
專(zhuān)家說(shuō)，經(jīng)常睡過(guò)頭的表現(xiàn)，可能是疾病的預(yù)兆。
但是如果你有過(guò)多睡眠的習(xí)慣，這可能是隱藏的健康問(wèn)題。這可能會(huì)縮短你的生命。
2007年芬蘭科學(xué)家發(fā)現(xiàn)，20%的睡眠高于8個(gè)小時(shí)的有生命危險(xiǎn)，在同一年，英國(guó)科學(xué)家發(fā)現(xiàn)，睡眠少于5個(gè)小時(shí)的人的生命危險(xiǎn)要比睡覺(jué)多于8個(gè)小時(shí)的人群，有生命危險(xiǎn)可能性正在增加，另一項(xiàng)科學(xué)顯示日常睡眠多于8個(gè)小時(shí)的人群更容易得中風(fēng)。
科學(xué)家說(shuō)睡眠和長(zhǎng)壽在一些時(shí)段里是有聯(lián)系的，但因素卻是混淆的。
可能有很多原因引起多過(guò)的睡眠，被稱(chēng)為睡眠過(guò)度。
問(wèn)題：差的睡眠質(zhì)量。
一個(gè)人可以睡足夠長(zhǎng)的時(shí)間，但是仍然感覺(jué)很累，是因?yàn)樗麄兊乃哔|(zhì)量不好。
睡眠周期通常在90分鐘左右。這分為第1階段，輕度睡眠，和過(guò)渡睡眠以及深度睡眠。分為4個(gè)步驟，然后就唏噓快速眼球轉(zhuǎn)動(dòng)（REM）當(dāng)一個(gè)人做夢(mèng)的時(shí)候。
問(wèn)題：其他身體問(wèn)題。
睡眠呼吸暫停， 窒息都是主要的問(wèn)題，也就是說(shuō)在睡眠的時(shí)候突然停止一段時(shí)間的呼吸。
通常這些問(wèn)題都是周期性的，經(jīng)常在睡眠的時(shí)候引起痙攣和抽搐。同樣睡眠過(guò)多也可能引起精神不佳。
