Sleep is ____ ____ our health. It is important to sleep ____ the dark. Sleeping with the light ____ could be bad for us. Turning ____ the light helps to keep ____ diabetes and heart disease. Around 40 per cent of people sleep ____ some sort of artificial light, like a television or alarm ____. The ____ thing is ____ with the main light. Sleeping ____ the dark is more difficult for people in ____. This is because there is a lot of ____ light ____ night. Dr Phyllis Zee is ____ expert in ____ medicine. She said it is healthier to ____ off lights ____ we sleep. She did a study on the blood sugar ____ of 20 people. The people ____ slept with a light on had ____ sugar levels ____ those who slept in ____ dark. Dr Zee said light ____ the brain active, which ____ blood sugar. There are three things we ____ do: turn ____ the lights, never sleep ____ white or blue light; and ____ ____ eye mask.

Sleep in the dark

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