It's probably from hypnagogia. When you're on the edge of sleep you can see and hear things that aren't there as if you were in a dream. As for hearing stuff from the white noise, it's like how sometimes if you fall asleep with the TV on bits that you can hear will get mixed in with your dream. It's a weird brain quirk but nothing to worry about.
Is it normal to hear music in white noise?
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It's probably from hypnagogia. When you're on the edge of sleep you can see and hear things that aren't there as if you were in a dream. As for hearing stuff from the white noise, it's like how sometimes if you fall asleep with the TV on bits that you can hear will get mixed in with your dream. It's a weird brain quirk but nothing to worry about.