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I don't see how it got it wrong (and it would be surprising if it did given the sentence is not syntactically ambiguous). It does use a visual notation which, AFAIK, differs from the standard in linguistcs [0].

[0]: https://en.wikipedia.org/wiki/File:Syntax_tree_for_Colorless...

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This site is producing dependency parses, which have become popular in the last 10 years or so. The linked figure is a phrase structure parse, which used to be the thing everyone worked on but have since turned out to be both harder to get and less useful than dependency parses.

It decided that "sleep," was a noun, rather than a verb (as in the diagram you note). If your parts of speech are wrong, it's not a successful parse.

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