The cost will be approximately from $200 to $500 inclusive of the course and actual diving component. The Professional Association of Diving Instructors offers an online segment of the training which should cost the trainee around $100. This will cover instructions but not the scuba diving trips in open waters. Prices fluctuate primarily because of the open water certification which can be as high as $500 or even more. There are diving shops that give packages of $200 to $350 for three dives.
1 Narcolepsy is caused by the loss of the two brain chemicals called hypocretins. 2  Researchers have identified a gene that is linked to narcolepsy.  The main symptoms of narcolepsy are excessive daytime sleepiness and abnormal rapid eye movement (REM) sleep.
1 Genetics: Researchers have found a genetic basis for narcolepsy, a neurological disorder of sleep regulation that affects the control of sleep and wakefulness. 2  Night shift work: People who work at night often experience sleep disorders, because they cannot sleep when they start to feel drowsy.