Dream recall, dream length, and sleep duration: state or trait factor.

@article{Schredl2008DreamRD,
  title={Dream recall, dream length, and sleep duration: state or trait factor.},
  author={Michael Schredl and Iris Reinhard},
  journal={Perceptual and motor skills},
  year={2008},
  volume={106 2},
  pages={633-6}
}
Longer sleep duration should be related to dream recall (longer REM sleep), but previous findings regarding the relationship between habitual sleep duration and dream recall frequency have been conflicting, whereas experimental manipulation of sleep duration yielded a significant effect. The analysis of diaries kept by the 444 participants over 14 days indicated that intra-individual fluctuations and interindividual differences in sleep duration affect dream recall. 

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