As it turns out, “exhaustion” means “side effects of inhaling a dangerous amount of nitrous oxide.”

Demi Moore, who was hospitalized after a friend called paramedics on Monday, was reportedly inhaling nitrous oxide. AKA that stuff at the dentist that makes you not give a sh-t that you’re getting a root canal.

According to TMZ, a friend of Demi’s who was at her home told emergency workers she was doing whippets. Whippets are a street name for some specific type of nitrous oxide inhalant; my coworker just informed me “the Beastie Boys were big into them.”

TMZ says it’s “not a common drug amoung people of Demi’s age and social status.”

Mike D on the other hand…

“It’s typically used by younger people who are looking for a cheap thrill,” the site continues.

The friend apparently became upset when Demi had a reaction to inhaling and lapsed into semi-consciousness.

Another source told PEOPLE that Demi has been on a downward spiral for a while now.

“Really, it was over the last year her friends saw a change,” the source said. “She wasn’t sleeping as well, didn’t seem to be eating and looked really gaunt.”

Another source summed it up: “Demi is a mess.”

Sources close to both Demi and Ashton said that Moore had a prescription drug problem and it was a contributing factor to her breakup with Ashton.

“It was a sticking point for Ashton. He wanted her to take care of herself and get a hold of things, and she wouldn’t.”