Several more clips about insomnia

• The No Wake Zone
  "There’s accumulating scientific and historical evidence that human beings, like many of our mammalian cousins, weren’t meant to follow what we consider a “normal” wake-sleep pattern of two strictly segregated blocks of time—16 uninterrupted hours awake, 8 uninterrupted hours asleep."
  
• Sleep Patterns In Children And Teenagers Could Indicate Risk For Depression
  "adolescents with a familial risk for depression but without a depression diagnosis experienced shorter REM latency, meaning they reached the REM stage more quickly. Those adolescents were more likely to develop depression by the end of the five-year study period than those who reached REM sleep later in the cycle."
  
• Bedfellows: Insomnia and Depression | Psychology Today
  But it may be that insomnia is more than just a symptom of depression. It may in fact unleash the mood disorder. If sleep researcher Michael Perlis, Ph.D., is right, insomnia may be an early harbinger of depression. His longitudinal studies show that it appears to precede episodes of depression by about five weeks.
  


• Gene May Determine How Much Sleep You Need : NPR
  "A team of researchers has found a genetic mutation that appears to allow some people to get by on less sleep than others. The team found the unusual mutation in a mother and daughter pair who appear to sleep less."