Sleep disorders as core symptoms of depression

@article{Nutt2008SleepDA,
  title={Sleep disorders as core symptoms of depression},
  author={David J. Nutt and Sue J. Wilson and Louise M. Paterson},
  journal={Dialogues in Clinical Neuroscience},
  year={2008},
  volume={10},
  pages={329 - 336}
}
Links between sleep and depression are strong. About three quarters of depressed patients have insomnia symptoms, and hypersomnia is present in about 40% of young depressed adults and 10% of older patients, with a preponderance in females. The symptoms cause huge distress, have a major impact on quality of life, and are a strong risk factor for suicide. As well as the subjective experience of sleep symptoms, there are well-documented changes in objective sleep architecture in depression… 
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