说到洗澡，大多数人要么是早上一起床就洗澡，要么是晚上睡觉前洗澡。
Advice on the proper time to bathe has varied with some experts saying a shower at night leads to better sleep, while others swear by a morning rinse to kick-start their day.
关于洗澡的最佳时间，专家们众说纷纭。有人说，晚上洗澡有助于睡眠，有人说，早上洗澡让人充满活力地开始一天。
Daily Mail Online scrolled the annals of shower studies and spoke to New York-based dermatologists to settle the score.
为了回答这个问题，每日邮报网站查看了关于洗澡的多项研究，并咨询了纽约皮肤科医生的意见。
We found that while both have their pros and cons, a shower at night washes off the sweat, oils and allergens of the day, giving you better shut-eye and radiant skin.
每日邮报网站发现，尽管早上洗澡和晚上洗澡各有利弊，但晚上洗澡可以洗去白天分泌的汗液、油脂和接触到的过敏原，让人睡得更香，皮肤更加容光焕发。
You’ll wash off the grime of the day
晚上洗澡可洗去白天的污垢
New York-based dermatologist Dr Samer Jaber told Daily Mail Online that a nighttime shower is good to wash off the dirt of the day.
纽约皮肤科医生萨米尔.贾贝尔告诉每日邮报网站说，晚上洗澡有助于洗去白天的污垢。
If you’re out all day and sweaty or working out you should definitely shower before going to bed,’ he said.
他说：“如果你白天在外面流了不少汗，或者去健身了，睡觉前肯定要洗个澡。”
He added that by the end of the day your body is covered in all kinds of allergens including pollen which can irritate your skin.
他还说，到了晚上，你的身体表面将被各种过敏原覆盖，包括会刺激皮肤的花粉。
In the spring you might be covered in allergens like pollen if you’ve been outside, so you would want to get that off your skin before going to sleep,’ Dr Jaber said.
贾贝尔医生说：“春天外出时，你的身上可能会沾上花粉等过敏原，睡觉前要把这些过敏原洗掉。”
But he said that regardless of a shower, the most important thing to do is wash your face at night before laying on your pillow to prevent oils from building up and causing acne.
不过，贾贝尔医生表示，无论洗不洗澡，最重要的就是在上床前洗脸，以避免油脂累积，引发痤疮。
Nighttime showers help you sleep
晚上洗澡有助于睡眠
Showers regulate your body temperature which can help you get better sleep.
洗澡可以调节体温，从而帮助你睡得更好。
Several studies have shown that taking a shower in the evening and at least 90 minutes before sleep will allow your body to heat up and cool down in time for adequate shut-eye.
若干研究显示，晚上洗澡，最好是睡觉前至少90分钟洗澡，可以让你的体温先上升后下降，从而保证舒适的睡眠。
Research adds that showers work as a stress reliever because they reduce cortisol levels.
研究还显示，洗澡可以释放压力，因为洗澡能让皮质醇水平降低。
Cortisol is a steroid hormone made by your adrenal glands that helps your body respond to stress, regulate blood sugar and fight infections.
皮质醇是肾上腺分泌的类固醇激素，能帮助身体应对压力，调节血糖，抵抗感染。
Sleep expert Dr Janet Kennedy told The New York Times: ’The body naturally cools down as bedtime approaches, in sync with the circadian rhythm.’
睡眠专家珍妮特.肯尼迪医生告诉《纽约时报》说：“随着睡觉时间到来，体温自然下降，和生物钟是同步的。”
Showering artificially raises the temperature again and allows for a faster cool down, which seems to hasten sleep,’ she added.
“洗澡是人为地让体温上升，之后又会迅速下降，可让人更快入睡。”
Showering is also a good way to unwind and release muscle tension which can aid in sleep.
洗澡也是放松的好办法，可以舒展紧张的肌肉，这也有助于睡眠。
You’ll have better skin with a shower at night
晚上洗澡会让皮肤更好
Your skin regenerates at night, not only on your face but on your entire body.
皮肤在晚上进行修复更新，不仅是脸上的皮肤，还有全身的皮肤。
