When a human is at stage 0, alpha waves are present and as a person gets more alert and attentive there are beta activities present which consist of irregular, low amplitude waves. When the person begins to feel drowsy it means he or she is about to enter stage 1, there the brain will show theta activities which is the switch from being alert to drowsy, leading to stage 2.
They work for dirt cheap, and work hard because they want to keep the work they receive, an immigrants usual only hope is a steady work whether or not they're illegal.
