In sonnet what does the phraseone short sleep pastmean?

In the context of the sonnet, the phrase "one short sleep past" refers to death. The speaker is reflecting on the brevity of life and the inevitability of death, and he uses the metaphor of sleep to represent the transition from life to death. He says that death is just "one short sleep" away, and that it will come to all of us eventually. This is a common theme in sonnets, which often explore the themes of mortality and the fleeting nature of life.