Dementia can be 'accelerated' by nighttime habit as groundbreaking study finds concerning link Irish StarPoor sleep is tied to faster brain aging, new study says. Here’s how it impacts people as young as 40 FortuneMRI indicates that poor sleep translates to poor brain health AuntMinniePoor Sleep May Add Three Extra Years to Your Brain's Age NewsweekBad sleep in your 40s can affect your brain later in life — here’s how New York Post