Carrie Fisher, the Star Wars actress who died last year in December, died from sleep apnea and  multiple of drugs that were found in her system, according to coroner reports. Traces of several drugs, including cocaine were found in her body. Although it was well known that Fisher had dealt with drug problems in her past, the coroner’s report focused more on the common sleep disorder, sleep apnea, which affects over 18 million Americans.

Sleep apnea, is a condition that causes breathing to be interrupted during sleep and can disrupt rest throughout the night. The most common sign of the condition is chronic snoring. This condtion can be deadly, it raises the risk of dying early by 46% and increases the chance of sudden cardiac death, according to a 2009 study.

While Fisher had drugs in her system, the coroner listed the cause of her death “undetermined” and there was no proven link between her drug use and sleep apnea, but experts say that substances like alcohol and medications can make the condition worse.

Fisher’s brother told Entertainment Tonight, “I would tell you, from my perspective that there’s certainly no news that Carrie did drugs. If you want to know what killed her, it’s all of it.”