About 65% of Americans say they have difficulty falling asleep a few       1     (night) each week, according to a recent study     2     (make) by the National Sleep Foundation. Sleeping too little can lead to a higher risk of becoming fat and getting depressed. Some of your favourite evening habits may have something to do with sleeping problems. For example, the light of your bright alarm clock can prevent you     3     falling asleep. You should make your room as dark as possible. What’s more, it’s not good to exercise late at night. Fierce physical activities raise your body temperature and are bad for a good night’s sleep.

9 . Jennifer Toth, who survived cancer as a child, is now a nurse at the hospital that helped save her life.

Toth was diagnosed (诊断) with hepatoblastoma when she was just 2 years old. No signs showed that anything was wrong with Toth until early 1995 when her mother felt a lump on her stomach. Her parents took her to Children's Hospital of Philadelphia, where scans showed she had a tumor (肿瘤) the size of a softball on her liver.

Hepatoblastoma is a tumor that begins in the liver and is usually found in children up to three years old. It is a rare form of cancer, affecting fewer than one in a million children, according to St Jude Children's Research Hospital. The exact cause is unknown. The survival rate is 80 percent if the tumor does not spread, and it can be removed following chemotherapy (化疗). If the entire liver is affected, then patients may need a liver transplant.

Toth's tumor was too large to remove so she went through six months of chemotherapy first. Luckily, after a few years of treatment at Children's Hospital, Toth was declared cancer-free.

Later she was awarded a college scholarship for cancer survivors, spending four years at the University of Pennsylvania, where she earned a Bachelor's of Science in Nursing.

Now, Toth is working as a nurse at that very same hospital. She told Fox News that she doesn't hide the fact that she is a cancer survivor. “ I always thought that it would be amazing to come full circle and work at the same hospital where I had been a patient,” Toth said, “ I hope that my experience as a patient and a survivor shapes my nursing practice in a way that conveys (传递) deep sympathy and understanding.”