What is the main idea of the first quatrain of sonnet 130 by William Shakespeare

Well if you ever read sonnet 130 you can tell that the wording isn’t modern so you might have trouble understanding the poem. The main idea is how he feel day and night how its can be hard to fall asleep to whom ever has a lot on their plate, and how its hard to focus during the day to someone who is stressed or in a struggle to suceed