If the Sigil app is actually sleeping any memory leaking must be in the Qt event loop as Sigil proper code is doing nothing at that point. A search of memory leaks and Qt reveals quite a long list of issues, some even platform specific given Qt reference counting and its internal object memory management. Sigil is also linked to the python3 lib as well, which is also notorious for memory issues.
Not sure if this helps. Based on other gui toolkits over the years, leaving an app open for long long periods of time without at least saving your file and closing the app is probably not a good idea at all.
My 2 cents.
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