If you are 5%-8% likely to get dementia as a baseline, but don't sleep enough, you're now 6.5%-10.5% likely to get dementia. Out of 1000 people who live to be

If you are 5%-8% likely to get dementia as a baseline, but don't sleep enough, you're now 6.5%-10.5% likely to get dementia. Out of 1000 people who live to be over 70 and sleep properly, ~65 of them get dementia. Out of another 1000 people who live to be over 70 and sleep improperly, ~80 of them get dementia. So an extra 15 people out of 1000 get dementia in the "sleep improperly" group. Someone please check my application of natural frequencies!