How long does it take you to get to REM sleep? Do you know what REM sleep is? Maybe it’s time to find your REM sleep in under 90 mins. Better sleep might equal less chance of dementia. This 12 year study found that as the amount of REM sleep decreased, the risk of dementia increased. “In our study, the association between lower REM sleep and dementia was not explained by those with cognitive impairment at baseline or by those who converted to dementia within the first 3 years, (which) suggests that reduced REM is not simply a consequence of early dementia,”