Good news -- I have the go-ahead to make the full SHHS XML annotation files available on sleepdata.org. My target will be to have them up by the end of next week (06/27). I will update you again when that happens.
Edit: The SHHS XML annotations are now available here: https://sleepdata.org/datasets/shhs/files/
Thanks for your question and for joining sleepdata.org.
We do have another set of XML annotation files for the SHHS sleep studies. These files contain the respiratory events of interest with timestamps and durations, as you would expect. We have been holding off on posting these because of some issues we were trying to resolve with missing oxygen desaturation events (that should have been present in the files). I will raise the topic at our next group meeting on Tuesday (06/17) and make a clear plan of action. My desired goal would be to post the XML files we do have within the next 1-2 weeks, with any problems noted within our dataset documentation.