Sleep labs are increasingly common as the importance of treating sleep disorders becomes more evident. Some 70 million Americans experience a sleep disorder, and with more than 80 different types of disorders out there, symptoms can vary quite a bit. Many of the disorders are mild annoyances, while others are severe disturbances so serious they can be fatal. Some are quite common — such as general insomnia, which affects about 30 percent of adults at any given time and about 10 percent of adults chronically [source: American Academy of Sleep Medicine]. Other problems considered sleep disorders include restless leg syndrome, habitual snoring, sleep starts, sleep paralysis, confusion arousals, teeth grinding, and circadian rhythm sleep disorders.