A Dream Bath is when a character bathes in a fantasy or dream.

List of Dream Bathing Scenes

May 27th, 1994 "Akazukin Chacha ep. 21"
There's a scene where Shiine fantasizes about the girls being nude in the bath, but it turns out later when they do stand up they are wearing swimsuits.
March 8th, 2001 "Pokemon ep. 188"
Jesse has a dream of bathing in a shell after she and Meowth strike oil.
October 26th, 2003 "Ai Yori Aoshi Enishi ep. 3"
Ai Yori Aoshi Enishi 3 15
Kaoru Hanabishi has a fantasy of him and Aoi Sakuraba bathing together.
July 22nd, 2004 "Ninja Nonsense ep. 3"
Shinobu has one about Kaede in a bubble bath and later on, Onsokamaru has one about both Kaede and Shinobu in a bubble bath.
November 9th, 2004 "Desert Punk ep. 6"
Desert punk 6 2
Kanata has a dream where he finds a giant lake and he finds Mariko Skinny Dipping in it.
June 21st, 2005 "Elemental Gelade ep. 12"
Elemental gelade 12 3
Cloud has a dream about Ren bathing in a Clawfoot Bathtub.
April 1st, 2008 "Tower of Druaga: Aegis of Uruk ep. 1"
The setting of the first episode is in a dream sequence and an unnamed Princess is shown having her Servant give her a bath.
July 3rd, 2008 "To Love-Ru ep. 14"
Haruna dream
A misfortune forces Rito Yuuki to have a bath while he is in the Sairenji Family's household. As he sits in the bathtub, he daydreams about Haruna Sairenji joining him.
May 27th, 2010 "Totally Spies! ep 128"
Totally Spies 128 1
Mandy is in a Dream Sequence Bathing scene.