A.
Higher blood pressure increases your risk for heart attacks.
B.
It is thought that the lack of sleep affects appetite.
C.
In the past, sleep was often ignored by doctors and surrounded by myths.
D.
Exposure to light during early waking hours helps to set your body clock.
E.
Short-time sleep also improves memory, learning ability and mood.
F.
Light exposure reduces the level of melatonin.