The Basics
Does it matter when I sleep?
Yes. We have a natural cycle for when we feel tired and awake. Sunlight plays a big role in this cycle.
Our “biological clocks” are set to make us feel the most sleepy between midnight and 7 a.m. Our biological clocks also help us stay alert during the day, although many people have a sleepy period between 1 p.m. and 4 p.m.
Our natural sleep cycle is very hard to break or change. When people have to work during the night, they can have trouble getting enough sleep during the day. People who travel to a different time zone can also have trouble sleeping.
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