Simple:
* The baby drifted off to slumber after a long day of playing.
* The town was shrouded in a peaceful slumber under the starry night sky.
Figurative:
* The old house seemed to be caught in a perpetual slumber, untouched by the passage of time.
* The project was finally complete, allowing the team to fall into a well-deserved slumber.
Literary:
* As the sun began its descent, the land was bathed in a golden light, casting long shadows that seemed to whisper tales of slumber and dreams.
* The wind, a gentle caress against the windowpane, sang a lullaby, inviting the weary traveler to surrender to slumber.
You can also use "slumber" in a more formal context:
* The king's advisors gathered in the council chamber, their faces etched with worry as they discussed the impending threat to the kingdom's slumber.
* The philosopher argued that true wisdom lay in the embrace of slumber, where the mind could wander freely and contemplate the mysteries of existence.