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That's one of the features I still have to add. I assume you mean like "after 45 minutes stop playing" or something like that, correct?

exactly. if it's just about helping your son fall asleep that should be plenty and not waste any unnecessary energy!

It's not just energy. There's been some research showing that people who sleep all night, every night with white noise suffer hearing loss.

I prefer to have my sleep sounds go off after a while for that reason

Good to know, will definitely look to add this in the next update!