This is why dreaming is good for your health

Dreaming used to be considered the brain noodling while you sleep — interesting, but not particularly important. Recent sleep research has changed that picture entirely. Dreams happen mostly during REM sleep, and REM sleep does specific work for your brain that nothing else can. Memory, emotional regulation, creativity — they all suffer when you don't dream enough. Here's what's actually going on, and why protecting your dream sleep matters more than people realise.

1. REM sleep, briefly explained
2. What it does for memory
3. Emotion processing
4. Creativity and problem-solving
5. What blocks dream sleep
6. How to get more of it

REM sleep, briefly explained

Sleep happens in cycles of roughly 90 minutes, each containing different stages — light sleep, deep sleep, and REM (Rapid Eye Movement). REM is when most vivid dreams occur. Your brain becomes intensely active, almost like waking, but your body is paralysed (so you don't act out your dreams). The first REM phase is short — maybe 10 minutes. By the morning, REM phases stretch to 30–60 minutes each.

What it does for memory

REM sleep helps consolidate memories from short-term to long-term storage. Specifically, it processes emotionally-tagged memories and procedural memories (skills, motor learning). People who learn a new skill and then sleep with normal REM consolidate the skill better than people who skip REM. This is why sleeping on it is real advice for learning.

Emotion processing

One of the most important functions of REM is emotional processing. During REM, your brain replays emotionally significant events from the day — but with the stress hormones turned off. This lets the brain integrate the experience without the original emotional charge. Without enough REM, emotional events stay raw. Studies link REM deprivation to higher rates of anxiety, depression, and PTSD-like symptoms.

Creativity and problem-solving

REM is when the brain makes unusual connections between ideas. This is why insights, creative leaps, and shower thoughts often come after a good night's sleep. Famous examples include Paul McCartney composing the melody for Yesterday in a dream, and Mendeleev reportedly conceiving the periodic table in a dream. The phenomenon is real, and it depends on healthy REM sleep.

What blocks dream sleep

• Alcohol — REM-suppressant. Even moderate evening drinking reduces REM sleep significantly.
• Cannabis — same, particularly with regular use.
• Some antidepressants — especially SSRIs.
• Sleep deprivation — REM is concentrated in the second half of the night, so cutting sleep short trims REM disproportionately.
• Disturbed sleep — frequent wakings prevent reaching deep REM cycles.

How to get more of it

The interventions that protect REM sleep overlap heavily with general sleep hygiene:

• Consistent, sufficient sleep duration (7–9 hours)
• Cool, comfortable bedroom — see our temperature guide
• Breathable bedding that doesn't disturb sleep — bamboo helps prevent the temperature-related wakings that interrupt REM cycles
• Limit alcohol, especially in the second half of the evening
• Avoid screens 60 minutes before bed

Sometimes nightmares disrupt REM-sleep too. For more, see on nightmares: cause, meaning, remedy.

Dreams aren't a luxury. They're part of how your brain repairs itself, learns, and processes life. Protecting them is part of protecting your mind.