Sleep hygiene studies use different sets of sleep hygiene recommendations,[REF] and the evidence that improving sleep hygiene improves sleep quality is weak and inconclusive [REF].
The strength of research support for each recommendation varies; some of the more robustly researched and supported recommendations include the negative effects of noisy sleep environments, alcohol consumption in the hours before sleep, engaging in mentally difficult tasks before sleep, and trying too hard to fall asleep [REF].