A new study found drinking coffee at bedtime, even the caffeinated variety, is not linked to sleeplessness.
Drinking alcohol, smoking cigarettes or vaping within four hours of going to bed are all more likely to lead to insomnia.
The research, conducted at Harvard and three other colleges, is one of the largest studies on how alcohol, caffeine and smoking impact sleep.
Copyright © 2019 KABC-TV. All Rights Reserved.