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It would be very discouraging if somewhere down the line you could ask a computer if the Riemann hypothesis is correct and it said, 'Yes, it is true, but you won't be able to understand the proof.'

I am convinced that during bouts of insomnia, I have sometimes slept without knowing it.

I looked on YouTube for sleep deprivation and there were videos of people experimenting with staying awake for a while. You saw all the different stages.

How can you prove whether at this moment we are sleeping, and all our thoughts are a dream; or whether we are awake, and talking to one another in the waking state?

Man has to awaken to wonder - and so perhaps do peoples. Science is a way of sending him to sleep again.

Don't think that because you haven't heard from me for a while that I went to sleep. I am still here, like a spirit roaming the night. Thirsty, hungry, seldom stopping to rest.

When we awaken, we cannot account for the time spent. We simply don't remember. About the only evidence we have of experiences while we were asleep is when we happen to remember a dream.

My sister could fall asleep at the drop of a hat. She would fall asleep on the train. Me, I never slept. Still. I have a hard time sleeping. But I used to admire her ability to wake up late.

I lose sleep at night wondering whether we are intelligent enough to figure out the universe. I don't know.