A new report finds that self reports of sleep time may be significantly higher than actual sleep times, with a difference of one hour in some cases. A team of researchers compared the results of the time reported sleeping on average per night by 2,113 adults with the results of their unattended home Polysomnography (PSG)/ sleep studies. It was found that the average nightly sleep time reported was about seven hours, while PSG revealed a mean sleep time of just over six hours. The study suggests that results from studies subjectively assessing sleep times may not be compared with those studies using objective methods of assessments.
JCSM vol 5 (3)- Mon June 15, 2009