Sandman (but which one?)

..and then, fighting to stay asleep, wishing it would go on forever, sure that once the dream was over, it would never come back... you woke up.

Odd and The Frost Giants, 50

"I've seen rainbows on the snow sometimes"..."...and on the side of buildings, when the sun shone on the icicles. And I thought, ice is only water, so it must have rainbows in it too. When the water freezes, the rainbows are trapped in it, like fish in a shallow pool. And the sunlight sets them free."