If you toss and turn night after night, you aren’t alone. Millions of American adults struggle with falling or staying asleep, making bedtime unnecessarily stressful. Even as they shuffle through their days like zombies, they find getting their Zzzs elusive. Insomnia can stem from various causes, but could one simple guideline, the 10-3-2-1-0 rule, help you get better sleep regardless of the reason?