Question 1

How does the prefix недо- work in недосыпать?

Accepted Answer

The prefix недо- indicates that an action is performed insufficiently or falls below a normal, healthy requirement. Here, it attaches to the root for sleep to create недосыпать (to get too little sleep, to be sleep-deprived). This is the exact opposite of the prefix пере- for excessive action, which gives us пересыпать (to oversleep).

Question 2

Wait, doesn't сыпать usually mean to pour? How did it end up in a word about sleep?

Accepted Answer

It looks identical, but it is a completely different root! When you add a prefix to спать (to sleep), forming the imperfective aspect requires adding the suffix -ы-, turning the root into -сыпать. So, спать becomes the perfective недоспать, which then becomes the imperfective недосыпать.

Question 3

Why is недосыпать strictly in the imperfective aspect in this sentence?

Accepted Answer

It must be imperfective because it immediately follows the verb начинают (start). In Russian grammar, phase verbs that show the beginning, continuation, or end of an action (like начинать, продолжать, заканчивать) always force the following infinitive to be in the imperfective aspect.

Question 4

Why is к началу used here to mean by the beginning instead of до начала?

Accepted Answer

The preposition к followed by the dative case (началу) translates to by or towards a deadline, showing that the lack of sleep builds up as the exams approach. If you used до начала (until the beginning), it would imply the students sleep poorly only up until the exams start, and then suddenly sleep fine once the exams actually begin.

Студенты часто начинают недосыпать к началу сессии.

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