Wakefulness

Tom's blinks became longer and longer as he entered the twilight zone between wakefulness and sleep.

Many hundreds of lives could be saved each year if all cars were fitted with driver wakefulness monitors.

I was, as it were, between sleep and wakefulness.

Similarly, the brain-penetrating Hrh2 antagonist zolantidine had no effect on light-induced phase shift as shown for hamsters, or the lengths or distributions of NREM, REM and wakefulness states as shown on rats.