Morning is the period of time
between dawn and noon.
Morning precedes afternoon, evening,
and night in the sequence of a day. Originally, the term referred to sunrise. The
ability of a person to wake up effectively in the morning may be influenced by
a gene called "Period 3". This gene comes in two forms, a
"long" and a "short" variant. It seems to affect the
person's preference for mornings or evenings. People who carry the long variant
were over-represented as morning people, while the ones carrying the short
variant were evening preference people.
Source
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