1. wakefulness

a periodic state during which you are conscious and aware of the world

Example Sentences:
'consciousness during wakefulness in a sane person is pretty well ordered and familiar'

2. sleeplessness, wakefulness

a temporary state in which you are unable (or unwilling) to sleep

Example Sentences:
'accept your wakefulness and sleep in its own contrary way is more likely to come'

Synonyms

• sleeplessness

3. alertness, vigilance, wakefulness, watchfulness

the process of paying close and continuous attention

Example Sentences:
'wakefulness, watchfulness, and bellicosity make a good hunter'
'vigilance is especially susceptible to fatigue'

Synonyms

• alertness
• vigilance
• watchfulness