Front

Wide awake

Back

Fully alert and awake.

Front

Nod off

Back

To fall asleep briefly, especially while sitting.

Front

Sleep on it

Back

To think about something before making a decision.

Front

Drift off to sleep

Back

To gradually fall asleep.

Front

Sleep a wink

Back

To not sleep at all or very little, often used in negative contexts.

Front

Oversleep

Back

To sleep longer than intended.