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dxyms

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If you get a positive with an uncertainty in its accuracy, at the very least, the test is repeated. But even more, you can use the information from the investigation of the reason for the false positive to improve the tests in the first place.

This assumes that the false positive is caused randomly. That's not the case. False positive tests are usually followed by false positive tests. Then it will take years to find out if it was a false positive or not.

According to the article on question: The effects of caffeine intake on the quality and quantity of sleep depend on the timing of its consumption. More specifically, caffeine consumed in the evening hours prolongs sleep latency10,11,12,13,14, reduces total sleep time (TST)10,11,12,14,15, shortens deep sleep10,12,13,14,15, and decreases electroencephalographically (EEG)-derived slow-wave activity (SWA)10, while activity in the sigma range is increased10.