in this video I will draw the EEG waveforms of our patient Bob going through the different stages of sleep going chronologically from Waking Life to Deep Sleep to Dreaming first Bob starts the process of going to bed by brushing his teeth right now his eyes are open and he has active mental concentration on his task his brain is busy which is reflected by the beta waves of the EEG waveform beta waves have the highest frequency 14 to 30 Herz and the the lowest amplitude which represent the organized chaos inside a busy brain next Bob lies down to sleep he closes his eyes and his brain transitions into the alpha wave pattern no longer processing visual information the brain slows down which is reflected by the 9 to 13 Herz Alpha Waves now Bob has fallen asleep and enters into stage one of non-rem sleep this state of reduced Consciousness shows on the E G as slower theta waves 4 to 8 Hertz and can also be found when undergoing deep meditation this stage of sleep is only 5% of the total sleep time for adults and so Bob quickly enters into stage two of non-re this stage looks similar to stage one but is characterized by sleep spindles and K complexes sleep spindles are bursts of Rapid rhythmic activity and K complexes are brief large spikes of AC activity sleep talking and teeth grinding happen in this stage which is also the plurality of sleep time at 45% of the total next Bob enters stage three of nonrem about 25% of Total Sleep time this stage is reflected on the EEG as delta waves which have the lowest frequency below 4 Hertz and the highest amplitude this is the deepest stage of sleep where Bob loses all bodily awareness unfortunately for some patients this is also when sleepwalking night terrors and bed weding can occur finally Bob completes a sleep cycle by entering into the most fun stage of sleep about 25% of the total sleep time rapid I movement or REM sleep this stage has Sawtooth like low voltage high frequency waves that most closely resemble beta waves there is a loss of motor tone throughout the body except in the extraocular muscles and the rapid eye movements this stage is when Vivid dreaming occurs usually lost to memory upon waking it is thought that REM sleep also facilitates memory processing to reinforce long-term memories two things to take away from this video first notice how the higher frequency waves correspond with more intense brain activity second know how to draw the six EEG waveforms in order by using the pneumonic at night bats drink blood this concludes our video on Bob's first sleep cycle be sure to like And subscribe for more videos