wakefulness

Definitions

The state or condition of being awake.

The quality of being alert or vigilant.

A period of being unable to sleep; insomnia.

Examples

The constant noise from the street made it impossible for him to drift into a state of deep wakefulness.

After hours of wakefulness, she finally felt her eyelids grow heavy as the sun began to rise.

Synonyms

alertness vigilance insomnia watchfulness awareness sleeplessness

Antonyms

sleepiness drowsiness lethargy slumber somnolence unconsciousness