Reports of insomnia are common among the elderly, but a new study finds that sleep problems may stem from the quality of rest and other health concerns more than the overall amount of sleep that patients get.

An estimated 30 percent of adults report having some symptoms of insomnia, which includes difficulty falling asleep, staying asleep or waking up too early and then not feeling well rested during the daytime. Prior studies suggest that nearly half of older adults report at least one insomnia symptom and that lack of restorative sleep might be linked to heart disease, falls, and declines in cognitive and daytime functioning.

The new study found discrepancies between self-reported insomnia and outcomes recorded on a sleep-monitoring device. Older adults’ perception of sleep does not always match what’s actually happening when a more objective assessment is used to monitor sleep patterns and behaviors.