Yep, when I'm really sleepy and is about to fall asleep I hear cacophony, familiar people's voices saying single words or short phrases. I even can hear my own

Yep, when I'm really sleepy and is about to fall asleep I hear cacophony, familiar people's voices saying single words or short phrases. I even can hear my own voice saying something short. It's very consistent and I use it as a sign that it's time to sleep.