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It is widely known that the current sleep medications do not provide good quality sleep. They also present a hazard in the elderly:

Drugs Aging. 2016 Feb;33(2):151-8. doi: 10.1007/s40266-015-0339-9.
The Effect of Sleep Medication Use and Poor Sleep Quality on Risk of Falls in Community-Dwelling Older Adults in the US: A Prospective Cohort Study.
Min Y1, Kirkwood CK2, Mays DP3, Slattum PW4.
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Abstract
BACKGROUND:
Sleep complaints and the consumption of medications for sleep are common in older adults. Falls are also a significant concern for older adults and sedative use has been identified as a risk factor for falls. Sleep quality is a potential confounder in studies evaluating the relationship between sleep medication use and falls. However, very few studies have assessed the combined impact of sleep medication use and sleep quality on the risk of falls.

OBJECTIVE:
The objective of this study was to evaluate the association between sleep medication use, poor sleep quality, and falls in community-dwelling older adults.

METHODS:
This was a multicenter, 6-month prospective cohort study conducted in senior housings settings in central Virginia, USA. Sleep quality was assessed using the Pittsburgh Sleep Quality Index (PSQI) and a medication review was conducted. Data regarding falls were collected over 6 months by use of a diary. Logistic regression modeling was used to examine the effects of poor sleep quality, sleep medication use, and both, on the risk of falls.

RESULTS:
Among 113 independently living older adults (mean age ± standard deviation 81.1 ± 8.6), 46.9 % fell at least once during a 6-month period; 62.8 % (n = 71) had poor sleep quality, and 44.2 % (n = 50) used medications or treatments to aid sleep. Compared with participants reporting good sleep quality and no sleep medication use, those who reported poor sleep quality and sleep medication use had an increased risk of falls after adjusting for covariates (odds ratio 3.23, 95 % confidence interval 1.05-9.91). The group with good sleep quality and sleep medication use, as well as the group with poor sleep quality and no sleep medication use had no significantly greater risk for falls compared with the group with good sleep quality and no sleep medication use.

CONCLUSION:
A combined effect of sleep quality and sleep medication use on the risk of falls suggests that medication effectiveness may be an important factor to consider in understanding the risk of falls associated with sedative medications.

https://www.ncbi.nlm.nih.gov/pubmed/26833349