The Washington Post answers some common questions about dreams.

3. Why are dreams hard to remember?

Some people insist that they never dream, but they are wrong. We know this from experiments that involve waking people at different stages during the night. Everybody dreams, but we don’t all remember them. This could be due to brain activity — those of us who tend to remember dreams have greater activity while asleep and awake in two parts of the brain involved in promoting images and storing memories than people who don’t remember their dreams.