Taylor Swift is sharing details about the routine that helped her relax after every “Eras Tour” concert.

At the end of the first episode of her new “End of an Era” docuseries, the singer gave viewers an inside look into how she gets out of performance mode — and it starts with drawing a bath.

Swift, who turns 36 on Dec. 13, elaborated on the routine in an interview with Stephen Colbert on its Dec. 10 episode.

The singer said she feels like a “flickering lightbulb” after every concert, which ran for more than three hours and featured upwards of 44 songs.

“I’ll go back to the hotel, get out of the costume, into the bath — — immediately — into the bath,” Swift said, calling it her special “mermaid time.”

Next, comes food and lots of it, Swift said.

“I get the most amount of room service possible,” the singer joked.

“French fries? What’s the go-to?” Colbert asked.

“Yes, everything,” she replied. “Everything that I want on that given night.”

Swift would also sign “2,000 CDs” or so after shows because doing “tactile hand activity” helped her to mentally decompress.

“It’s like when I’m doing bread stuff,” she said, referring to her highly publicized habit of baking sourdough loaves for loved ones.

“My kind of ‘profession,'” Swift added, putting air quotes around the word, “is coming up with ideas for stuff. So if I can turn off the ideas for a second — very exciting.”

Finally, she said she typically turns on the television to watch a favorite show.

“I’ll put on my ‘Dateline,’ do you know what I mean?” she said, prompting the audience to laugh.

When Colbert asked her about reading, Swift said she is “constantly” listening to audiobooks.

When the host asked for favorite reads, Swift instead described the “elements” of what she looks for in a book.

Swift first name-checked Daphne du Maurier’s classic gothic mystery “Rebecca” as an example of a book that might intrigue her.

“If you’ve got like an old rambling shambles, old British mansion covered in moss or ivy, and there’s a mysterious relationship and he may not be what he seems,” she said as Colbert’s audience began laughing.

“And there’s been a murder that has happened in the past but there’s the idea of a ghost or an actual ghost,” she continued.

Swift went on to hilariously describe two other book ideas that would pull her in as the audience kept laughing. One centered around a “mysterious” family living “off the coast of Maine,” and the other concerned a marriage that “isn’t what it seems” –— preferably told by an “unreliable narrator.”

“If you’ve got any of that, I’m going to need to read that,” she said, “and when I say read that, I am going to need someone to read that to me.”

Swift’s record-breaking “Eras Tour” took her all over the globe from March 2023 until its final concert in Vancouver, Canada, on Dec. 8, 2024. The tour was chronicled in her new docuseries, “Taylor Swift: The End of an Era,” which premiered Dec. 12. Two new episodes will drop Dec. 19 before the finale airs Dec. 26.