Usages of недосыпать
Студенты часто начинают недосыпать к началу сессии.
Students often start getting too little sleep by the beginning of finals.
Если постоянно недосыпать, можно серьёзно заболеть.
If you constantly don't get enough sleep, you can get seriously ill.
Ему удалось закончить задачу к понедельнику, хотя он постоянно недосыпал.
He managed to finish the task by Monday, although he was constantly not getting enough sleep.
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