Everyone dreams, we dream about 2 hours a night. But we do not always remember it.
Five sleep phases
There are five sleep phases: from light sleep to deep sleep, to REM sleep, the phase of rapid eye movements, active brain and raised heart rate. We dream most in REM sleep. Four cycles a night.
What dreams mean
On the meaning of dreams there is no consensus. Freud saw dreams as expressions of the deepest desires. Later scientists thought dreams have no meaning, only brain activity. Today it is assumed that dreams process the day's experiences.
No logic
During a dream there is no logic. Comparable to a brainstorming session. Mendeleev claimed to have solved the periodic table in a dream.
Remembering
We forget up to 95% of our dreams on waking. Tip: stay lying down for a moment in the morning and write your dreams in a notebook.