- The study examined the relationship between sleep quantity and pain tolerance in 81 healthy children aged 6-13. Pain tolerance was measured by how long each child kept their hand submerged in cold water. Sleep was measured by child and parent reports of bedtime and wake times. - Results found that less total sleep was correlated with lower pain tolerance, but this relationship disappeared when controlling for age. Older children had higher pain tolerance. - The study concludes that a simple relationship between sleep quantity and pain was not supported. Future research should examine sleep quality in addition to quantity and consider gender differences in pain tolerance.