There are three categories of sleep deprivation and insomnia. The first stage, called “initial” insomnia, is when you first realize you’re having difficulty achieving a sleep state and occurs when it takes longer than a half an hour to fall asleep. “Middle” insomnia is when you have difficulty staying asleep. Once awakened, you stay awake through the wee hours of the morning. The most sever level of insomnia is “late” or “terminal” insomnia. This is when you wake up early in the morning and stay awake after sleeping less than 6 hours…………………………..