Roughly half of patients with cancer have symptoms of insomnia, and many may have sleep problems that linger for at least a year, a small study suggests.
Up to 10 percent of adults in the developed world suffer from chronic insomnia, and cancer patients are particularly prone to it, researchers note in Sleep Medicine.
For the study, researchers examined data on 405 cancer patients in Germany who were 59 years old on average and completed two assessments of insomnia severity：once when they joined the study and again twelve months later.
The most common malignancies were breast cancer, tumors of the prostate or testicles, and colorectal cancer. Most patients - 83 percent - were being treated for a first-time cancer. The rest of them had a relapses or secondary tumors in a different location than the original cancer.
At the start of the study, 49 percent of the patients had insomnia symptoms, and 13 percent had severe enough sleep problems to meet the clinical definition of insomnia, the study found. After a year, 64 percent of the patients who started out with insomnia were still suffering from symptoms.
linger：動詞，持續、徘徊。例句：The pain lingered on for weeks.（疼痛持續好幾週。）
be prone to：片語，有…傾向、易於…的。例句：Her son is prone to colds.（她的兒子容易感冒。）
start out：片語，開始起步、出發。例句：He started out in the maintenance department.（他起初是在維修部門工作。）