In American English that should be “lie down”. The word “lay” takes an object as in “lay down the book and pay attention to me”. “Lie” and “lay” are difficult verbs, especially as telling an untruth is to “lie” – same spelling yet vastly different meaning. Ach.
It a song title by Eric Clapton.
I looked it up (thinking it might be a regional variation) but the best explanation I could find was this: “Lay Down Sally” is grammatically incorrect, as it would mean taking Sally and actually placing her horizontally. When asking Sally to join him in bed, Clapton’s correct grammar would be “Lie Down Sally.” He’s in good company: Bob Dylan also ignored this rule of grammar in “Lay Lady Lay.” [https://www.songfacts.com/facts/eric-clapton/lay-down-sally] Maybe they (Clapton and Dylan) just thought it sounded better.
pictures imperfect blog 
That must have been a big day but does look like a lovely place to lay down for a while
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In American English that should be “lie down”. The word “lay” takes an object as in “lay down the book and pay attention to me”. “Lie” and “lay” are difficult verbs, especially as telling an untruth is to “lie” – same spelling yet vastly different meaning. Ach.
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It a song title by Eric Clapton.
I looked it up (thinking it might be a regional variation) but the best explanation I could find was this: “Lay Down Sally” is grammatically incorrect, as it would mean taking Sally and actually placing her horizontally. When asking Sally to join him in bed, Clapton’s correct grammar would be “Lie Down Sally.” He’s in good company: Bob Dylan also ignored this rule of grammar in “Lay Lady Lay.” [https://www.songfacts.com/facts/eric-clapton/lay-down-sally] Maybe they (Clapton and Dylan) just thought it sounded better.
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English is just too damn hard even for native speakers and singers.
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😄
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