Sleep inertia is the reduction in alertness and cognition that people experience up to four hours after waking.
For example, investigators say that SI experienced by the captain during the 2010 Air India Express air disaster—which resulted in the deaths of 158 people—could have been a factor in the crash.
"If you don't wake properly, your work performance can be degraded for periods up to four hours, and that has been linked to major accidents," Stuart McFarlane, an author of the study from RMIT, said in a statement."You would assume that a startling 'beep beep beep' alarm would improve alertness, but our data revealed that melodic alarms may be the key element. This was unexpected.
For their study, the researchers surveyed 50 people using an online questionnaire, asking various questions about the types of sounds that they used for their alarms and how alert they tended to feel after waking up. The study is limited by the fact that the results are based on self-reported survey responses and, thus, the researchers did not directly test how SI is linked to the type of alarm tone. However, they do suggest a potential mechanism to explain the results that they recorded.iStock
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