The most common sleep disorder that impacts people everywhere is Insomnia. Nearly all of us at one time or another have had trouble falling asleep or remaining asleep. However when it becomes reoccurring this is known as Insomnia. At first glance Insomnia, like most disorders is a personal problem that seems to only impact people at the individual level. However this is false. When people have reoccurring troubles with sleep this has great impacts on their physical health which negatively effects their functionality at work.
A recent research study conducted by the Harvard Medical School and the University of Michigan found staggering results. Researchers conducted a questionnaire on the sleeping habits of over 7000 working adults. Their findings were as followed.

I totally agree Elijah. There is a growing set of studies that shows # of hours and quality of sleep is related to many outcomes related to health, wellbeing and performance.
One study in particular show that among professional athletes, those who slept 10-12 hours before competition played better than those who slept the usual 6-8 hours before.