How about using "Golden Slumbers" - written by Thomas Dekker whose dates were 1575–1641 (subsequently borrowed from by Paul McCartney), so the period would be right:

GOLDEN slumbers kiss your eyes,
Smiles awake you when you rise.
Sleep pretty wantons, do not cry,
And I will sing a lullaby;
Rock them, rock them, lullaby.

Care is heavy, therefore sleep you;
You are care, and care must keep you.
Sleep pretty wantons, do not cry,
And I will sing a lullaby;
Rock them, rock them, lullaby.

Mind you, Dekker might not have been too approved of, in a puritan household, since he wrote plays, and they were a bit Talibanesque about things like that. But maybe a lullaby woudl be acceptable? All depends how bigotted they are in the play you're doing...