Differences between subjective and objective sleep duration according to actual sleep duration and sleep-disordered breathing: the Nagahama Study.

STUDY OBJECTIVES Since subjective sleep duration (SSD) is considered to be longer than objective sleep duration (OSD), results of SSD minus OSD (SSD-OSD) might always be thought to be positive. Some recent reports showed different results but exact results have not been obtained. The difference between SSD and OSD may change according to OSD. We investigated this difference and its association with sleep-disordered breathing (SDB) or nonrestorative sleep (NRS). METHODS This cross-sectional study evaluated 6908 community residents in Nagahama city, Japan. SSD was determined by self-administered questionnaire. OSD was measured by wrist actigraphy and sleep diary. SDB was assessed according to the 3% oxygen desaturation index adjusted for OSD. RESULTS Worthy of notice was that SSD was shorter than OSD longer than 6.98 hours in all participants, 7.36 hours in males and 6.80 hours in females. However, SSD was longer than OSD (mean±SD: 6.49±1.07 vs 6.01±0.96, P OSD. When OSD was >6.98 hours, participants reported or perceived SSD

Keywords:

• Actigraphy
• Physical therapy
• sleep duration
• community resident
• sleep disordered breathing
• Medicine
• Breathing
• exact results
• subjective sleep
• Sleep diary

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