You have crazy dreams
The two main types of sleep that occur are rapid eye movement (REM sleep) and non-rapid eye movement (NREM sleep). “During REM sleep, the stage of sleep most associated with dreaming, there is an increase in the firing rate of most neurons throughout the brain, as compared to non-REM sleep,” according to the Division of Sleep Medicine at Harvard Medical School. There is more brain activity during REM sleep than when we are awake. Harvard reports that when people are woken up in the middle of REM sleep, they report having vivid dreams. However, people do not report having vivid dreams as frequently when awakened from NREM sleep. Thus, “the pattern of brain activity during REM sleep probably underlies the intense dreaming that occurs during this state.”
And you can have recurring dreams, too
In addition to having some crazy dreams, you can have repeat dreams as well. According to Psychology Today, 60 to 70 percent of adults have recurrent dreams. And they often indicate the presence of “an unresolved and persistent conflict in an individual’s life,” per Psychology Today. That said, not all recurring dreams are negative, Angel Morgan, MD, told huffingtonpost.com. Check out these other facts about dreams that might keep you up at night.
You feel like you’re falling
These involuntary twitches are called hypnic jerks, and up to 70 percent of people experience them occasionally. No one knows exactly why they occur, but according to the National Sleep Foundation, one theory suggests they happen as a result of a “natural downshifting of the nervous system that occurs as you fall asleep.” Another theory claims that the brain “misinterprets the relaxing of muscles as a sign that you’re actually falling.” Caffeine, stress, and sleep deprivation can increase the frequency of hypnic jerks.