So many people are sleep-deprived, over-caffeinated, and burnt out. Insomnia or sleep deprivation contributes to MANY different health concerns, including an increased risk for cancer, heart disease, depression, anxiety, stroke, diabetes, etc.
There are many reasons people have difficulty falling asleep, from drinking caffeine too late in the day to having too much noise and bright lights on.
Furthermore, being in an uncomfortable environment, having a sleep schedule off, or struggling with a mental disorder such as anxiety or depression can lead to sleep problems.