“Effect of Melatonin on Sleep Quality and Morningness–Eveningness in Late Shift Workers: A Randomized Controlled Trial” – Pubmed NCBI NIHM Article (Error Code: 504) (Note: I included the error code in the title to provide additional context, but if you want a simpler title, you could use:) “Melatonin Improves Sleep Quality in Late Shift Workers: A Randomized Controlled Trial”