Sigma (Ï) values are experimental values that are assigned to substituents that take into account both a substituentâs resonance and inductive effects. The sigma value has a sign (+ or -) and a magnitude or numerical value.
Dr. Yu found that prone sleeping was strongly associated with all kinds of charged dreams, such as having sex, being locked up, being smothered or unable to breathe, having a love affair with a celebrity, seeing a UFO, and being naked.
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 12â14 Hz waves that occur for at least 0.5 seconds.[1][2] Sleep spindles are generated in the reticular nucleus of the thalamus.