Public Health surveillance systems can be passive or active. A passive surveillance system consists of the regular, ongoing reporting of diseases and conditions by all health facilities in a given territory.
Insomnia. The glow of the alarm clock is all too familiar. Insomnia refers to an inability to fall asleep or stay asleep, or a tendency to wake up too early or experience poor sleep. 1  Definition. 2  Symptoms. 3  Causes.
The difference between sleep deprivation and insomnia is that sleep deprivation means not having the chance to get a full night's sleep, and insomnia refers to not being able to take advantage of sleeping time by managing to fall asleep.