The way this question is framed suggests you might be hitting the same wall most people hit with your.
Here's the diagnostic framework I use for this exact type of problem.
**Most likely culprit:** self-diagnosing without professional input. This accounts for roughly 50% of cases I have seen.
**Second possibility:** The approach you are using worked in a different context and you are trying to apply it where it does not fit. sleep has specific conditions where it works well and conditions where it falls apart.
**Less common but worth checking:** a timing or sequence issue that only shows up under specific conditions.
To narrow it down: add logging or observation at each stage to see where things diverge. That will tell you which of these you are dealing with.
by miawright86808