Happiness is the clear head of the morning

 As soon as Phoebus' rays inspect us,

First, sir, I read, and then I breakfast.

-- Matthew Prior

Happiness is the vaporless morning

 The morning is the best, because the imagination is not clouded by the vapours of meat.

-- John Dryden

Happiness is the misty morning

When first the sun too pow'rful beams displays,

It draws up vapours which obscure its rays:

But ev'n those clouds at last adorn its way,

Reflect new glories, and augment the day.

-- Alexander Pope