lack of sleep; sleep deprivation
Refers to insufficient sleep, often with health or performance consequences. Used in both casual and formal contexts.
Lately I can't concentrate because of lack of sleep.
Lack of sleep is bad for your health.
I've been sleep-deprived lately because I'm busy.
I made a mistake at work because of sleep deprivation.
I slept a lot over the weekend and made up for my lack of sleep.
He suffers from chronic sleep deprivation.