"Melatonin" by Radiohead is a haunting and enigmatic song that can be interpreted in several ways. The first verse suggests a parental figure encouraging their child to go back to bed, to rest and recharge. The second verse reiterates parental confidence in the child's abilities, expressing the belief that they won't come to harm. These lines may reflect the universal desire for shelter and comfort, to feel protected and safe.

However, the tone shifts dramatically in the third verse, with a menacing command to "Death to all who stand in your way." This sudden turn suggests the possibility that the song is addressing a protagonist venturing into a violent and dark world. The lyrics may be interpreted as a call to arms, a mission to emerge victorious over all obstacles and enemies with the guidance and support of the parents.

Another interpretation could be that the song is about the struggles of sleep and the use of melatonin supplements. The parents are urging the child to return to bed, implying that the child may suffer from insomnia. The melatonin supplements could be seen as a way to cure the sleep deprivation, and the sinister tone of the third verse could be interpreted as a side effect of the supplements' effect on the child's psyche.

In conclusion, "Melatonin" by Radiohead is a haunting song that can be interpreted in various ways. However, the lyrics suggest a desire for protection and comfort despite the potential for violence and darkness. It could be interpreted as a parent-child relationship or as a mental state that needs care, direction, and guidance.