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发帖数: 21830 | 3 吃Melatonin （在中国又叫脑白金）
Melatonin - Overview
What is melatonin?
Melatonin is a hormone made by the pineal gland camera.gif, a small gland in
the brain. Melatonin helps control your sleep and wake cycles. Very small
amounts of it are found in foods such as meats, grains, fruits, and
vegetables. You can also buy it as a supplement.
What does natural melatonin do in the body?
Your body has its own internal clock that controls your natural cycle of
sleeping and waking hours. In part, your body clock controls how much
melatonin your body makes. Normally, melatonin levels begin to rise in the
mid- to late evening, remain high for most of the night, and then drop in
the early morning hours.
Light affects how much melatonin your body produces. During the shorter days
of the winter months, your body may produce melatonin either earlier or
later in the day than usual. This change can lead to symptoms of seasonal
affective disorder (SAD), or winter depression.
Natural melatonin levels slowly drop with age. Some older adults make very
small amounts of it or none at all.
Why is melatonin used as a dietary supplement?
Melatonin supplements are sometimes used to treat jet lag or sleep problems
(insomnia). Scientists are also looking at other good uses for melatonin,
such as:
Treating seasonal affective disorder (SAD).
Helping to control sleep patterns for people who work night shifts.
Preventing or reducing problems with sleeping and confusion after
surgery.
Reducing chronic cluster headaches.
Is taking a melatonin dietary supplement safe?
In most cases, melatonin supplements are safe in low doses for short-term
and long-term use. But be sure to talk with your doctor about taking them.
Children and pregnant or nursing women should not take melatonin without
talking to a doctor first.
Melatonin does have side effects. But they will go away when you stop taking
the supplement. Side effects may include:
Sleepiness.
Lower body temperature.
Vivid dreams.
Morning grogginess.
Small changes in blood pressure.
If melatonin makes you feel drowsy, do not drive or operate machinery when
you are taking it.
During health exams, tell your doctor if you are taking melatonin. And tell
your doctor if you are having trouble sleeping (insomnia), because it may be
related to a medical problem.
In adults, melatonin is taken in doses from 0.2 mg to 20.0 mg, based on the
reason for its use. The right dose varies widely from one person to another.
Talk to your doctor to learn the right dosage and to find out if melatonin
is right for you.
【在 c*******r 的大作中提到】
: 昨天晚上因为感冒喝了板蓝根十点多就睡觉
: 睡到中午十一点
: 一觉醒来感冒是好了
: 今晚一点睡意都没有
: 真是痛苦啊
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