Why did Friar Laurence persuade Juliet to drink the potion? What does the literary term mean "And then awake as from a pleasant sleep"?
He wants to save her life, and perhaps he is moved by the intensity of her love. To be specific, she says she'll kill herself rather than marry Paris. Rather than let her do that, he will help her pretend to die, so that she can escape her family's will and marry Romeo.
The potion will put her into a (death-like) sleep from which she can then awaken; that's what the other line means.
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