alert [əˈlɜːt] - able to think quickly and clearly, stiff - firm, hard, or difficult to bend, melatonin - a hormone that helps you sleep, a big dip - a big decrease, to digest food - to change food that you have just eaten into substances that your body can use, to emit light [ɪˈmɪt] - to send out light, to decrease sharply - to go down quickly and suddenly, a dawn [dɔːn] - the time at the beginning of the day when light first appears,

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