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Difficulty Falling Asleep question

Known as: Difficulty Falling Asleep, Have Difficulty Falling Asleep, I had difficulty falling asleep 
A question about whether an individual has or had difficulty falling asleep.
National Institutes of Health

Papers overview

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2014
2014
This study examined the association between sleep quality and the metabolic syndrome and whether if it is independent of sleep… 
Highly Cited
2011
Highly Cited
2011
2003
2003
This study evaluated self-reported subjective health and effects of sleep loss according to perceived interfering cognitive… 
1986
1986
ABSTRACT Insomnia may be categorized as difficulty falling asleep, frequent awakening, early awakenings or a combination of each… 
1975
1975
Triazolam, 0.4 and 0.8 mg, flurazepam, 15 and 30 mg, and placebo were compared in a double‐blind, randomized 5‐night crossover… 
1973
1973
Electrophysiological and self-report data were obtained from 10 and 20 Ss, respectively, during 15 days of baseline, 30 days of…