 Yeah, somewhere in the region of 8 hours 12 minutes on average every night, and that's in stark contrast to Japan and Singapore, which came out bottom of this analysis of 100 countries' data with just 7 hours and 24 minutes. So not that far off an hour difference between the heaviest and lightest sleepers. So sleep is crucial for brain function, and as James mentions, the amount of sleep you get varies over the course of your life.