"lack sleep" is correct and usable in written English.
You can use "lack sleep" to describe a situation in which someone is experiencing insomnia or other sleep deprivation. For example, "She was having trouble concentrating in class due to her lack of sleep."
You lack faith," she answers with perfect simplicity: "I lack sleep".
But for the first time in recent memory, many see an edge by the other camp, fueled in part by the 2010 documentary "Race to Nowhere," which focuses on the detrimental effects of overprogramming students who lack sleep and joy.
Most lack sleep, many sustain poor diets, and few have the time to invest in routine self-reflection which would lead to healing and growth.
But epidemiologists noticed that people who work early in the morning or late at night — or who lack sleep in general — have higher rates of diabetes, stroke and high blood pressure, among other ailments.
Caregivers often lack sleep as they provide around-the-clock care.
Women reported that they lack sleep, no longer go out (particularly during the first 40 days postpartum when they are supposed to remain indoors according to Islamic beliefs and local custom) and generally spend their time caring for their child; they particularly reported enjoying the twice-daily bathing of the baby, an activity that is diligently performed.
The majority lacked sleep and were surprised by the results.
Does that mean if I keep lacking sleep I will also start performing bad in my grades?
"You see your coach, up all day just like you, lacking sleep, too, and he's excited.
If you're lacking sleep, the effects will show up in your work sooner or later.
In literacy tests there were 76% of 9 and 10-year-olds lacking sleep.
