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Evolutionary psychology
The study and development of the mind and survival using natural selection.
Genes
Units of heredity that work together to control brain function and behavior.
Sex drives
Evolutionary psychologists suggest that men tend to have stronger sex drives compared to women.
Mate selection
Women are more cautious and guarded when choosing a mate due to their ability to bear and nurse a child.
Personal attractiveness
Men place more emphasis on personal attractiveness when seeking a mate.
Waists and fertility
Men are biologically inclined to seek out women with waists 1/3 smaller than theirs as it is a sign of good fertility.
Critics of evolutionary psychology
Opponents argue that evolutionary psychologists work backward, use hindsight bias, and discount social and cultural changes.
Culture and behavior
Our behavior is influenced by both genetic predispositions and our interactions with culture.
Stages of sleep
There are four stages of sleep, and it takes about 90 minutes to pass through them.
NREM sleep
The first three stages of sleep are known as non-rapid eye movement sleep.
REM sleep
The fourth stage of sleep characterized by rapid eye movement, paralysis, and dreaming.
Brain waves
The brain's waves change according to the sleep stage one is in.
Suprachiasmatic nucleus (SCN)
A pair of cell clusters in the hypothalamus that controls circadian rhythm.
Melatonin
The pineal gland adjusts melatonin production in response to light, affecting feelings of sleepiness.
Disruption of circadian rhythms
Excessive melatonin from supplements can disrupt our circadian rhythms.
Note 
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