In this study, all participants, their companions, investigators, and healthcare staff responsible for patient care will remain unaware of the group allocations until the study is completed. This means that the investigator and the individual conducting the sampling, like the participants themselves, will not know which patient is receiving the melatonin or the placebo. Both patients and their companions will also be unaware of the type of pill being given. The drugs and placebos will be coded by someone who is completely blinded to the study process, and the code will be placed in an envelope that indicates whether it's the drug or the placebo. One group will receive drug A, and the other group will receive drug B. Furthermore, the melatonin and placebo tablets, which are identical in color, size, and shape, will be used in the study. Therefore, this will be a double-blind study. The placebo tablets will contain starch and will look, smell, and feel identical to the melatonin tablets.