In the first 90 minutes of sleep, you go through deepening stages—ranging from light sleep to deep sleep. Upon entering REM sleep, your heart rate and breathing become irregular, your eyes move rapidly and your brain activity rises toward the same level as when you're awake. That's when you do about 80 percent of your active dreaming—and when dreams are most vivid. You'll go through this sleep cycle three to five times during the night, spending more time in REM sleep with each one until you wake up in the morning.
Although we dream anywhere from two to five times per night, we rarely recall our dreams. We don't always remember them, though, because we may not be waking up at the right time, Walker revealed to Business Insider. Still, most of us remember at least a few dreams — and some of them may be downright confusing. This is especially true when we're dreaming of someone other than ourselves.
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