Sleeping patterns in female guinea pigs; effects of sex hormones.
D000818:Animals; D004958:Estradiol / Q000494:pharmacology*; D004971:Estrus / Q000502:physiology*; D005260:Female; D006168:Guinea Pigs; D011374:Progesterone / Q000494:pharmacology*; D012895:Sleep, REM / Q000187:drug effects / Q000502:physiology*
D011374:Progesterone; D004958:Estradiol