To evaluate the effects of mattress size on sleep feelings estimated by standardized OSA sleep inventory MA version and sleep quality measured by actigraph, eighteen healthy subjects (8 males, 10 females), aged 61-65, were recorded, sleeping in their homes for 15 consecutive nights under two crossover designed conditions from Friday. A subject slept for 7 consecutive nights (4 adaptation nights and 3 nights for analysis) on a 78cm wide mattress first and then for 8 consecutive nights (4 adaptation nights, 3 nights for analysis and excluded last night) on a 100cm wide mattress. The results showed the sleep on a 100cm mattress indicated better sleep quality and feelings.
