PSYCHOLOGY OF EMOTIONS

Detailed explanation-1: -Stage 3 sleep is also known as N3 or deep sleep, and it is harder to wake someone up if they are in this phase. Muscle tone, pulse, and breathing rate decrease in N3 sleep as the body relaxes even further. The brain activity during this period has an identifiable pattern of what are known as delta waves.

Detailed explanation-2: -Deep, slow brain waves known as delta waves begin to emerge during NREM stage 3 sleep-a stage that is also referred to as delta sleep. This is a period of deep sleep where any environmental noises or activity may fail to wake the sleeping person.

Detailed explanation-3: -Stage 3 lasts only a few minutes and constitutes about 3 to 8 percent of sleep. The EEG shows increased high-voltage, slow-wave activity (Figure 2-2). The last NREM stage is stage 4, which lasts approximately 20 to 40 minutes in the first cycle and makes up about 10 to 15 percent of sleep.

Detailed explanation-4: -If you awaken in the last NREM stage or the REM phase, this could cause you to feel disorientated or groggy. The reason for this is that Stage 3 NREM is a deep sleep, while REM is when dreaming occurs. The link between REM sleep and dreaming goes back over half a century.