One person who was seated in the row behind the person who made the noise told the Los Angeles Times it appeared like the woman was waking up from a sleep attack.
“Pretty quickly, she sort of fell onto her partner’s shoulders, and then onto his lap. And then her body went limp,” they said.
“Maybe like five seconds later, she kind of awoke, and that’s when she let out a scream.”
After the woman made the sound, the concertgoer said her partner and another person sitting next to her asked if she was okay, and she replied she was.
The Los Angeles Philharmonic is yet to publicly address what happened.