I listen to mine out loud either under my pillow or next to it. Last night was the latter.
Can’t say I get the greatest sleep anyway (even when not listening to subs) - it used to be better until I broke the observation barrier (my own phrase for when you don’t realise something/someone is doing something until people point it out).
I would say it interrupts sleep personally.
However it doesn’t seem to affect my boyfriend who tends to sleep for a long time and fall back to sleep if necessary.