Media playback is unsupported on your device Media caption Woman describes how "villains" in a dream told her to swallow her engagement ring

A US woman has undergone surgery after removing and swallowing her engagement ring in her sleep.

Jenna Evans, 29, said she and her fiancé Bobby had been on a speeding train and she was forced to swallow the ring to protect it from "bad guys".

She woke at her home in California to realise the episode had been a dream, but saw her diamond ring was missing.

She said she knew exactly what had happened, woke up Bobby to explain, and the couple went to a hospital.

Ms Evans said she struggled to recall the situation to medics "because I was laughing/crying so hard".

An X-ray scan identified the 2.4-carat ring in her stomach, and doctors agreed it would be unwise "to let nature take its course".

Ms Evans, a San Diego resident, later had a procedure to remove the ring but said she was asked to sign release forms in case of her death.

"Then I cried a lot because I would be so mad if I died," she said. "I waited a long time for that damn engagement ring and I will marry Bobby Howell."

The procedure was a success, and Ms Evans said she woke up "hysterically crying".

"I was really happy because I don't know if I can look at it and appreciate it in the same way," she told ABC news channel.