Simple:
* I was restless and couldn't sleep.
* The restless child fidgeted in his seat.
Descriptive:
* The restless energy of the city vibrated through the streets.
* She felt a restless longing for adventure.
Figurative:
* His restless mind was a whirlwind of thoughts.
* The restless spirit of rebellion was in the air.
Context-specific:
* The restless horse pawed at the ground, impatient for its ride.
* The restless audience waited for the show to begin.
The best sentence for you will depend on the context and the specific meaning you want to convey.