Thank you very much! You really made it clear to me!

"Essentially he is bemoaning[complaining about] the fact that even a sailor boy tossed in a storm gets better sleep than him. He resigns himself to the fact that he isn't going to sleep anytime soon. He says: “Then, happy low, lie down.” This is addressed to the commoners, the “low” people. He tells them to sleep for he who wears the crown has no peace of mind nor time to feel at ease and to rest." -Anajana Krishnan https://www.quora.com/What-is-the-meaning-of-Then-happy-low-lie-down-from-the-poem-Soliloquy-on-Sleep-by-Shakespeare Hope that helps!