The Good-Morrow is an aubade, a love poem sung at dawn that greets the morning by recalling the pleasant night spent with the lover and the togetherness they shared while also lamenting as they realize that they should soon be parted.

In The Good-Morrow the greeting aspect of aubade is particularly emphasized, celebrating the astonishing power of love that transcended them from individuals who dwelled on the unsophisticated pleasure to wholesome, perfectly balanced souls that are awakened in a new world.

To read other examples of John Donne's aubade, see The Sunrising.

Source: https://poets.org/glossary/aubade

Truth

It can also be interpreted as a marital oath, implying that the previous night they spent together is not an ordinary one but a wedding night. The plausible addressee of this poem is Donne's wife , Anne More.