Bro, you skipped a couple lines. The next part is, “I tuck you in, warm within, keep you free from sin, till the Sandman, he comes.” Then you sleep with one eye open while gripping your pillow tight.
If you have ever had a good bout of food poisoning that cleans you out I guarantee you’re bitching and swearing about it when in the throes of it. So if the story were real I’d bet there was plenty of choice English for people nearby to pick up on.