Sunrise is an important time of day, heavily symbolic of new beginnings, renewal, and looking forward.
Most games don't take much notice of time of day or the weather, other than to tell the PCs that they need to make camp and sleep. Use the cues and rhythms of the natural world to set a scene, a mood, and to symbolise the story behind what is happening. The wolf attack should always take place during a thunderstorm. The rocket should launch by the light of the moon. Ships should sail on the morning tide with a fair wind - unless of course it's on a Voyage of Fate. Duels should occur in the hot sun of high noon. Deals should be made with underworld netrunners on the streets of Tokyo in a slippery grey rain that greases the steel and neon canyons with a sheen of modernity and slicked-down grime.
And midnight, when most of the party is asleep and a single weary member is on watch, is a great time to throw the undead hordes at them.
Obi-Wan: Wow, some landing.
Obi-Wan: Owen and Beru Lars. This looks like the place.
Obi-Wan: Padmé and Anakin's son. Can you take care of him?
Beru Lars: It would fill our hearts with gladness.
Beru Lars: We'll keep him safe. He will never fear danger.
Obi-Wan: Thank you.
Beru Lars: We have a very large stockpile of weapons and food.
Obi-Wan: That's... good. I hope.
Beru Lars: He'll be able to bullseye womp rats in our T-16 by the time he's five.