Of all the stories to come out of the Tiger Woods scandal, one of the most bizarre is that the golfer – recently named Athlete of the Decade by the Associated Press – reportedly used Ambien with his mistress to ramp up the couple’s sexual excitement.

Rachel Uchitel, who was the first woman to be publicly identified as Woods’s mistress, is said to have told friends that she and Woods took Ambien when they had sex.

“You know you have crazier sex on Ambien,” Uchitel told a friend, according to the website RadarOnline.com. “You get into that Ambien haze. We have crazy Ambien sex.”

(On Thursday, the British newspaper Daily Mail reported that Woods would enter rehab for treatment of sex addiction as well as addiction to Ambien and the painkiller Vicodin.)

Read The Truth About Sex Addiction

The Ambien-sex phenomenon is all the stranger because the substance, a prescription hypnotic, is meant as a short-term treatment for insomnia. So it sounds like Ambien would be the last thing you’d want to take before getting busy. But for some, the drug appears to rev them up rather than knocking them out.

Ambien is considered safe when taken as directed, but in rare cases people report strange side effects, according the FDA medication guide for Ambien, including “Ambien amnesia.” In other words, users walk, eat, sleep, use the phone and even drive after taking Ambien but have no memory whatsoever of what they did (they usually learn about it from witnesses).