8. Not everyone knows how important it is to sleep in the dark rooms of a house. - Use THE for countable specific nouns, 9. About 40% of people sleep with an artificial light on, such as a lighted alarm clock. - Use AN before a vowel sound, 10. An expert on sleep medicine said it is healthier to not sleep with a light on. - Use A or AN for non-specific nouns, 11. Sleepiness is hard to achieve with the lights on. - Don't use articles for nouns describing abstract ideas (concepts), 12. Turning off the light when we sleep helps to keep away diabetes and heart disease. - Use THE with uncountable specific nouns, 13. Listening to the waves of the Atlantic Ocean can help put you to sleep. - Use THE with the names of oceans, seas, rivers, and canals, 14. The Smiths said that they sleep better using the tips from the research. - Use THE before the last name of members of the same family ,

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