Some people don't have dreams because they don't sleep well. Things like stress or anxiety can mess up their sleep, making it hard to dream. Also, if they have bad sleep habits or use substances, it can affect their ability to remember dreams. Even things like noise or too much light can stop them from dreaming properly.

Some people might not dream because of biological or psychological reasons. They might naturally not remember their dreams as much as others. Differences in how their brain works during sleep or mental health issues can also affect dreaming. Sometimes, medications can stop them from dreaming too.

People might not dream because of their lifestyle or lack of interest. Busy lives can mean they don't get enough sleep to dream. Some people just don't care about dreams or don't think they're important. They might focus more on their daily life and not pay attention to dreams.