But research is still preliminary, experts say

Here are some potential causes

Drug can spike blood pressure, making existing blood vessel conditions worse, study authors say

Young adult males and binge drinkers more likely to drive while drowsy, study finds.

Doing so creates strongest family bond, researcher explains

Young adult males and binge drinkers more likely to drive while drowsy, study finds.

Doing so creates strongest family bond, researcher explains

But problems are rare, findings should not cause alarm, experts say

Hurricane Arthur serves as reminder to check emergency food, water and medical supplies

MRIs showed brain activity that mirrored what's seen in a dream-like state