I agree, I'm so sorry about the twin. That is truly terrifying.
I also agree that at 15 months it should be MUCH less of a worry (though *should* doesn't necessarily help).
I don't have experience with the sleep monitors, aside from the occasional story in both directions - either it saved the baby's life or didn't help to save the baby's life. I know they are also prone to false alarms.
Hopefully you can find something to put you at ease and get the baby another nap!

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