dawn

Henry V, Act 4, Scene 1:
"next day after dawn, / Doth rise and help Hyperion to his horse."

The soul at dawn is like darkened water
that slowly begins to say Thank you, thank you.
- Rumi, 'I was dead, then Alive', translation by Coleman Banks.

See awake.

OED2 gives the Shakespeare quotation from 1599 as its earliest example for the noun; the verb is recorded from 1499. "Dawning" as a noun dates to 1297 and comes from "dawing" recorded circa 900.

Henry V, IV, I has:

...Not all these, laid in bed majestical,
Can sleep so soundly as the wretched slave,
Who with a body fill'd and vacant mind
Gets him to rest, cramm'd with distressful bread;
Never sees horrid night, the child of hell,
But, like a lackey, from the rise to set
Sweats in the eye of Phoebus and all night
Sleeps in Elysium; next day after dawn,
Doth rise and help Hyperion to his horse,
And follows so the ever-running year,
With profitable labour, to his grave...

I remember hearing once that the noun form of dawn was first used by Shakespeare in one of his plays. I can't find any information online that would directly supports this. I can only find indirect support with Online Etymology stating that the noun version was first recorded in 1599. Does anyone else know anything about this?