Deep sleep is important for everyone. The actual amount of sleep depends (23)_____ your age. A young child ought to sleep ten to twelve hours, and a teenager about nine hours. Adults differ a lot in their sleeping habits. For most of them, seven to eight hours a night is (24)_____, but some sleep longer, while others manage with only four hours.
For a good night, having a comfortable (25)_____ to sleep is very important. Also, there should be (26)_____ of fresh air in the room. A warm drink sometimes helps people to sleep, although it is not a good idea to drink coffee immediately before going to bed.
If you have to travel a very long distance, try to go to bed earlier than usual the day before the journey. This will help you to feel more (27)_____ when you arrive.
Deep sleep is important for everyone. The actual amount of sleep depends (23)_____ your age.