。
I couldn't sleep a wink last night.
Literal
Last-night [topic-は] not-at-all sleep-potential-not-[past-かった].
ちっとも is the colloquial/emphatic 'not at all' — always paired with a negative predicate. More expressive than 全然 in some contexts; both mean 'not one bit, not in the least.' 眠れなかった is the past negative potential of 眠る — 'couldn't sleep.' A classic complaint about insomnia.