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не мог заснуть

couldn't fall asleep

→ не
phrase Rare #27,613
couldn't fall asleep This form refers to a male speaker in the past. The phrase changes with the subject's gender and tense.
RU: Вчера я не мог заснуть до двух часов ночи.
EN: Yesterday, I couldn't fall asleep until two in the morning.

Я не мог заснуть прошлой ночью.

I couldn't fall asleep last night.

Я не мог заснуть.

I couldn't fall asleep.

Я тоже не мог заснуть.

I couldn't fall asleep either.