REM Sleep: Normal Amount, Function, and How to Get More
Updated: 2026-06-30
REM sleep (rapid eye movement) is the stage where the brain is almost as active as when awake while the body stays paralyzed. REM is when we have vivid dreams, process emotions, and consolidate procedural memory. A normal amount is 20–25% of total sleep, and most of it lands in the second half of the night. Below is what counts as normal, why REM matters, and what actually increases it.
How much REM is normal
In adults REM is roughly 20–25% of total sleep — about 1.5–2 hours on a 7–8 hour night. The absolute number depends heavily on how long you sleep: REM dominates the later cycles, so every hour you cut in the morning comes mostly out of REM.
Don't chase other people's numbers. What matters is the stability of your own REM share and your total sleep duration. One low night is normal; persistently low REM despite normal time in bed is what to watch.
What REM does
REM acts as overnight therapy for emotions: the brain replays the day's events while noradrenaline is low, which strips out their emotional charge. Chronic REM deficit is linked to higher anxiety and poorer mood regulation.
Its second key role is memory and learning. REM consolidates procedural skills (motor, language) and helps surface non-obvious connections that underpin creative problem-solving. That makes the night after intense learning especially REM-expensive.
What suppresses REM
Alcohol is REM's main enemy. Even a moderate evening dose pushes REM into the second half of the night and cuts it in the first, leaving fragmented sleep toward morning. In Oura data this shows up as a REM dip the night after drinking.
Many medications suppress REM too — chiefly SSRI/SNRI antidepressants, along with nicotine and cannabis. Stopping these abruptly often causes a "REM rebound" with vivid, intense dreams.
How to increase REM
The biggest lever is sufficient sleep duration and a consistent wake-up time. Because REM piles up toward morning, an extra hour of sleep adds disproportionately to REM. Sleep restriction steals REM more aggressively than deep sleep.
Skip alcohol for at least 3–4 hours before bed (ideally entirely on workdays), keep the bedroom cool (18–20 °C / 64–68 °F), and don't wreck your schedule on weekends. Verify the effect against your own two-week REM trend — the "alcohol/schedule → REM" link is easy to see in your data.
FAQ
How much REM sleep do I need per night?
Aim for 20–25% of total sleep — roughly 1.5–2 hours on a 7–8 hour night. The absolute amount rises with sleep duration, so look at both the share and your total time in bed rather than a single number.
Why is my REM sleep low?
The most common causes are sleep restriction (REM falls in the later cycles), evening alcohol, nicotine, and some antidepressants (SSRIs). Less often it's an irregular schedule or an overly warm bedroom. Remove factors one at a time and watch the trend.
Can I increase REM sleep without medication?
Yes. Sleep enough, wake at a consistent time, drop evening alcohol, and keep the bedroom cool. These simple steps add REM naturally because it accumulates in the second half of the night.