Translations:Unstable adaptation/7/en

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In some cases, REM sleep can be increased as well. Causes may include depression[1] or intense mental activity[2]. The latter is still controversial, because other studies[3] have shown no connection between REM duration and mental activity such as studying intensity.

  1. Cite error: Invalid <ref> tag; no text was provided for refs named Berger
  2. Cite error: Invalid <ref> tag; no text was provided for refs named Koninck
  3. Cite error: Invalid <ref> tag; no text was provided for refs named Siegel