The error message you shared indicates the sleep module is not available.
In general, to correct a "module not available" problem, what you need to do is, insure the module is installed on the server side.
In Apigee Edge this means invoking the "npm install" command via the Management API. In practice the API call looks like this:
curl -i -X POST -d 'command=install' \
https://api.enterprise.apigee.com/v1/o/$org/apis/$proxy/revisions/$rev/npm<br>;
Before you do that, modify your package.json to use proper hygiene and provide a specific version for the modules in question. You said yours is
{"dependencies" : { "sleep": "", "http":"" } }
That might be legal, not sure, but even if it is, I would want specific versions there. Just good hygiene.
Having said that, I'm not sure the sleep module works in Trireme. It relies on a C++ library and that may not work as it does in node v8. You can test the module yourself outside of Apigee Edge by following the instructions provided here in this article on the Trireme Launcher.
What are you really trying to do with your use of the sleep module? what's the technical use case? If you're just exploring, then I suggest checking out some other npm modules instead. Try some that don't depend on c++ extensions, like http or request or moment-timezone or etc. Lots of other options obviously.
good luck.
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