(CNN)Many people suffering from insomnia take medication to get a better night's sleep.
While many sleep aids work over short periods of up to six months, clinical trial data has showed, insomnia can be a chronic problem — and many people end up taking these drugs for longer.
The study's research on more than 600 women ages 42 to 52 in the United States found that those who used medication to help their insomnia over a one- to two-year period did not get a better night's sleep than those who did not take any prescription sleeping pills.
These medications included benzodiazepines, Z-drugs which include zolpidem (Ambien), zaleplon (Sonata) and eszopiclone (Lunestra), as well as other drugs mostly intended for different conditions, such as anxiety and depression.
An estimated 9 million adults in the US have been prescribed drugs to help with falling and staying asleep, according to the study.
The US researchers from institutions including Brigham and Women's …