When you are ready to go to sleep, go over what you did that day from the time you got up until you get into bed.

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Peace of mind assured, I go to sleep, ready to do it all again tomorrow.

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If you think about it, it makes sense for a prey animal to sleep on its feet ready to flee predators.

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Mr Pearson, the South of Scotland MSP, had suggested that, having visited the Bishopbriggs facility, the curfew appeared to have a "very positive effect on the prison" because it encourages prisoners to go to sleep, "which means, in the morning, they are more engaged and ready to go out and do something".

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This includes going to sleep and waking up every morning, ready to work towards making our lives, and the lives of our children better.

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It's an attempt to bring some sunlit consistency to space exploration, simulating Earth-like lighting patterns to help keep the crew alert and get them ready for sleep in the evenings.

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