Analysis of Sonnet 28: How can I then return in happy plight

How can I then return in happy plight
That am debarred the benefit of rest?
When day's oppression is not eased by night,
But day by night, and night by day oppressed?
And each, though enemies to either's reign,
Do in consent shake hands to torture me,
The one by toil, the other to complain
How far I toil, still farther off from thee.
I tell the day, to please him, thou art bright
And dost him grace when clouds do blot the heaven;
So flatter I the swart-complexioned night,
When sparkling stars twire not thou gild'st the even.
    But day doth daily draw my sorrows longer,
    And night doth nightly make grief's length seem stronger.