Sedating antihistamines wiki
Stage 3 and 4, or Deep Sleep: Together, stage 3 and 4 are known as deep sleep, or slow-wave stage.As you progress into this stage, fewer and fewer of the brain’s processing centers stay active and the firing of the remaining brain cells become more and more coordinated.
On the EEG, the predominant brainwave slow to four to seven cycle per second.
The stage 2 sleep is commonly seen in the transition between other sleep stages, and overall about half the night is usually spent in stage 2 sleep.
One very interesting aspect of stage 2 sleep is that about every two minutes, EEG tracings show a pattern called a , which scientists think represents a sort of built-in vigilance system that keeps oneself poised to be awakened if necessary since K-complexes can provoked by certain sounds or other external or internal stimuli.
Sleep and Age As we age the sleep trends of adulthood continues, and after reaching age 60, the sleep latency and the percentage of time spent in stage 1 and 2 increase, while the total sleep time, and percentage of time spent in deep sleep and REM, and sleep efficiency all continue to drop. Primary insomnia : Chronic difficulty in falling asleep and/or maintaining sleep when no other cause is found for these symptoms.
Not too surprisingly, the older we get, the more likely we are to supplement nighttime sleep with daytime naps. Secondary insomnia : Often caused by illness or disease, a non sleep condition such as Angina, Heartburn, or Depression or medication taken for a such conditions.