men REM sleep erections sexual dream content

An erection during sleep does not mean a sexual dream

Partial or full erections occur during 80–95% of REM sleep in men, while only about 12% of men's reported dreams contain sexual content. An erection during sleep is therefore not a reliable sign that someone is having a sexual dream.

Immune cells can attack when a normal ID badge disappears

Healthy cells normally show MHC I molecules on their surface. These act like ID badges that tell natural killer cells not to attack. Some infected or cancerous cells lose these badges, and natural killer cells can attack because the familiar signal is missing.

Poor nutrition early in life can cause lasting damage

Poor nutrition during a child's first 1,000 days can permanently limit physical and mental development. Food alone is not the whole problem: infections and parasites caused by poor sanitation can also stop the body from absorbing enough nutrients.

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men REM sleep erections sexual dream content

An erection during sleep does not mean a sexual dream

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