Sleep Spindle

A sleep spindle is a burst of oscillatory brain activity visible on an EEG that occurs during stage 2 sleep. It consists of 12–14 Hz waves that occur for at least 0.5 seconds.

Read more about Sleep Spindle:  Function

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    It is only when we speak what is right that we stand a chance at night of being blown to bits in our homes. Can we call this a free country, when I am afraid to go to sleep in my own home in Mississippi?... I might not live two hours after I get back home, but I want to be a part of setting the Negro free in Mississippi.
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