The last time I slept around 9pm, the price of spaghetti was like N100. I've to start sleeping very early.

This sentence up there means; I don't have a clear recollection of when I slept as early as 9pm, if I could guess it was when the price of spaghetti was like N100, which we all know was a very long time ago. Now, I've to start sleeping early If I want the current price to reduce.

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