nature of sleep 0.0 / 5 ? PsychologySleepA2/A-levelAQA Created by: Abby Foster-TurnerCreated on: 12-05-14 10:03 Nature of Sleep: Ultradian Rhythm The sleep stages are an ultradian rhythm because they take 90 minutes. In a night’s sleep a person will go through 4-5 NREM/REM stages. 1 of 8 Nature of Sleep: What? As a person falls asleep their brain waves become larger in amplitude and slower as they go through NREM stages 1-4. 2 of 8 Nature of Sleep: Stage 1? Brain produces theta waves (5-7 Hz) and they are easily woken. 3 of 8 Nature of Sleep: Stage 2? K Complexes occur which are large spiky waves. Sleep spindles also occur. 4 of 8 Nature of Sleep: Stage 3? Large slow delta waves occur- deeply asleep. 5 of 8 Nature of Sleep: Stage 4? Delta waves dominate the EEG. 6 of 8 Nature of Sleep: REM? After 90 mins of NREM, REM begins. The EEG resembles the waking state and brain appears active. Brain waves are fast, de synched and low voltage. 7 of 8 Nature of Sleep: REM cont? The person’s eyes move rapidly but all other muscles are paralysed. Vivid dreams occur. Body temp stops regulating. 8 of 8
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