Do the two sentences have the same meaning: Why not sleep? Why don't you sleep? The sentence background is that I met my friend online and it was at midnight, so I wanted to ask why she stays up that late.
Top answer
" are ways of suggesting that the person should sleep, or encouraging them to sleep. "
— GPY
" are ways of suggesting that the person should sleep, or encouraging them to sleep.
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"Why not sleep?" and "Why don't you sleep?" are ways of suggesting that the person should sleep, or encouraging them to sleep. I think you probably mean "Why aren't you asleep?"