Put your finger on the moon and drag it down, imagining the sun coming up simultaneously. Visualize the sky changing from night colors to red, orange and pink for dawn, then light blue... Like a really fast time lapse. Or, just go inside a building and close the door; when you open it again, fully believe it will be daytime outside. But know that nighttime is just as awesome as day; it doesn't prevent you from flying or doing anything.