Sleep is becoming an increasingly rare commodity and as zzz's dwindle at night, your energy and ability to concentrate diminishes by day. But here's the eye-opening news: Sleep deprivation can also impair your reaction time as much as alcohol does. According to a new study from the prestigious Stanford University Sleep Disorders Clinic and Research Center, subjects with a mild or moderate level of sleep disorder performed worse in a 10-minute test of reaction speed than people whose blood alcohol level was above .08, the legal limit in many states. In other words, they're just as dangerous…