It's measurements.

If the numbers repeat in a pattern, it's fine as long as the pattern isn't broken.

If the numbers don't repeat in a pattern, it's fine as long as it doesn't become a pattern.

If the pattern or lack of it changes, start worrying. It will be fine as long as it resumes regular operation. Else, things have changed.

If the numbers are replaced with words, something of importance was discovered. It will be fine as long as the words don't mention you directly.

If the words weave a tale or address you/somebody else, you need to wake up. It is time to wake up.

If you can't wake up, I'm sorry, you've missed your number or sequence. Try again on a different frequency.

...

It's usually that kind of thing that attracts the curious.