Asleep! O sleep a little while, white pearl!
And let me kneel, and let me pray to thee,
And let me call Heaven's blessing on thine eyes,
And let me breathe into the happy air,
That doth enfold and touch thee all about,
Vows of my slavery, my giving up,
My sudden adoration, my great love!
(…) “happy air” refers to the air of Heaven, which is said to be pure. Possibly meaning he wants to join her in Heaven.