<p><strong>Conclusion DREAMING EXPLAINED</strong></p> <p>Each night, we spend about one and a half to two hours dreaming. We dream about once every 90 minutes of sleep. The time you spend in dreams becomes longer throughout the night, from about 10 minutes to around 45 minutes or slightly longer. But what happens when we sleep?</p> <p>There are five stages of sleep: four stages of NREM (Non-REM) sleep, also called SWS (Slow-Wave Sleep), and one stage of REM (Rapid Eye Movement) sleep. The most vivid dreams, and therefore the ones we remember the most, occur during REM sleep (though we dream in other stages too). One sleep cycle is roughly 90 minutes long.</p> <ul> <li>(NREM) The first stage is a transition state between wakefulness and sleep. This is the stage that hypnagogic imagery occurs in. It usually passes into stage 2 within a few minutes.</li> <li>(NREM) During stage 2, the body gradually shuts down, and brain waves become larger.</li> <li>(NREM) Stage 3 usually occurs 30 to 45 minutes after falling asleep the first time. Large, slow delta brain waves are generated.</li> <li>After stage 4, the NREM stages reverse and move back to stage 2, and then into REM sleep.</li> <li>(NREM) Stage 4 is often called "deep sleep" or "delta sleep". The heart beats the slowest and there is the least brain activity. It is during this stage that sleepwalking usually occurs.</li> <li>(REM) During REM sleep, some parts of the brain are nearly as active as while awake. In this