Quick Answer: How to Increase Deep Sleep
The most effective ways to increase deep sleep are: exercise regularly (but not within 3 hours of bedtime), keep your bedroom cool (18-20 degrees Celsius), maintain a consistent sleep schedule, avoid alcohol before bed, and sleep on a supportive mattress that minimizes nighttime awakenings. Deep sleep naturally decreases with age, but these habits help maximize what your body can produce.
Brad, Owner since 1987: "We have been helping Brantford families sleep better since 1987. Every customer gets personal attention, honest advice, and the kind of follow-up service you just do not get from big box stores."
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Why Deep Sleep Matters
Deep sleep (Stage N3) is when your body does its heaviest repair work. Growth hormone is released, tissues rebuild, the immune system strengthens, and the brain clears metabolic waste products including beta-amyloid (associated with Alzheimer disease). Adults typically spend 13-23% of their sleep in deep sleep, concentrated in the first third of the night.
If you feel physically unrefreshed despite sleeping 7-8 hours, you may not be getting enough deep sleep. The quality of your deep sleep is as important as the quantity of your total sleep.
The Glymphatic System and Deep Sleep
Research from the University of Rochester discovered that during deep sleep, your brain activates the glymphatic system, a waste-clearance pathway that flushes out toxins and metabolic byproducts. This system is 10 times more active during deep sleep than during wakefulness. One key toxin cleared is beta-amyloid, a protein linked to Alzheimer disease. This finding has fundamentally changed how neuroscientists view sleep, from a passive state to an active brain-maintenance process.
Proven Ways to Increase Deep Sleep
1. Exercise Regularly
Physical activity is the most powerful deep sleep enhancer. A study from the Journal of Clinical Sleep Medicine found that regular moderate exercise increased deep sleep duration by up to 75%. The key: exercise at least 3 hours before bedtime. Morning or afternoon exercise is ideal. Late evening workouts can delay sleep onset.
2. Optimize Bedroom Temperature
Your body needs to cool down to enter and maintain deep sleep. A room temperature of 18-20 degrees Celsius is ideal for most adults. If you sleep hot, a cooling mattress, breathable sheets, and a fan can help maintain the thermal environment your body needs for deep sleep.
3. Consistent Sleep Schedule
Your circadian rhythm regulates when deep sleep occurs. Going to bed and waking up at the same time daily (even on weekends) programs your brain to produce deep sleep at the right time. Irregular schedules confuse this timing.
4. Limit Alcohol
Alcohol may help you fall asleep but it dramatically reduces deep sleep and REM sleep. Even moderate drinking (2 drinks) can reduce deep sleep by 20-30%. If you enjoy a glass of wine, have it at dinner rather than at bedtime.
Mattress Factors That Affect Deep Sleep
Pressure relief: Poor pressure relief causes micro-awakenings that pull you out of deep sleep without fully waking you.
Temperature regulation: An overheating mattress raises core temperature, which is incompatible 
with deep sleep maintenance.
Motion isolation: Partner movement causes brief arousals that disrupt deep sleep cycles.
Support: Poor spinal alignment causes muscle engagement even during sleep, reducing depth of sleep.
Deep Sleep and Age
Deep sleep naturally decreases with age. A 25-year-old might spend 20% of the night in deep sleep. By 60, that drops to 5-10%. This is normal but can be partially offset by exercise, good sleep habits, and a comfortable sleep environment. Older adults who exercise regularly maintain higher deep sleep levels than sedentary peers of the same age.
The Hot Bath Trick
Taking a warm bath or shower 90 minutes before bed can increase deep sleep. The mechanism is counterintuitive: the warm water raises your skin temperature, which triggers your body to rapidly cool down afterward. This accelerated cooling helps your body reach the lower core temperature needed for deep sleep onset. Research from the University of Texas found this technique reduced the time to fall asleep and increased deep sleep duration.
Sleep Quality Matters in Brantford
At Mattress Miracle, we focus on sleep quality, not just comfort. When your mattress supports uninterrupted sleep cycles, you get more deep sleep and wake up feeling genuinely restored. We have been helping Brantford families find that quality of sleep since 1987.
Medical Disclaimer: The information in this article is for educational purposes only and does not constitute medical advice. If you are experiencing chronic pain, sleep disorders, or other health conditions, please consult a qualified healthcare professional.
Find Your Perfect Mattress at Mattress Miracle
We are a family-owned mattress store in Brantford, helping our community sleep better since 1987. Come try mattresses in person and get honest, no-pressure advice.
441 1/2 West Street, Brantford, Ontario
Call 519-770-0001Frequently Asked Questions
Can supplements increase deep sleep?
Magnesium glycinate (200-400mg) before bed may support deeper sleep by helping muscles relax and supporting GABA activity. Consult your healthcare provider before starting supplements.
Does a sleep tracker accurately measure deep sleep?
Consumer sleep trackers (Fitbit, Apple Watch, Oura) estimate deep sleep using heart rate and movement but are not as accurate as clinical EEG. They are useful for tracking trends but not precise percentages.
Is it possible to get too much deep sleep?
Excessive deep sleep is rare and usually indicates illness, recovery from sleep deprivation, or a sleep disorder. If you consistently feel unrested despite long sleep, consult a doctor.
Sources
- Walker M. Why We Sleep: Unlocking the Power of Sleep and Dreams. Scribner. 2017. ISBN: 978-1501144318.
- Okamoto-Mizuno K, Mizuno K. Effects of thermal environment on sleep and circadian rhythm. J Physiol Anthropol. 2012;31(1):14. DOI: 10.1186/1880-6805-31-14
- Krauchi K. The thermophysiological cascade leading to sleep initiation in relation to phase of entrainment. Sleep Med Rev. 2007;11(6):439-451. DOI: 10.1016/j.smrv.2007.07.001
- Haskell EH, Palca JW, Walker JM, Berger RJ, Heller HC. The effects of high and low ambient temperatures on human sleep stages. Electroencephalogr Clin Neurophysiol. 1981;51(5):494-501.
Visit Mattress Miracle
Find us at 441 1/2 West Street, Brantford, Ontario. Rated 4.9 stars on Google. Family-owned since 1987.
Sources
- Walker, M. P. & van der Helm, E. (2009). "Overnight therapy? The role of sleep in emotional brain processing." Psychological Bulletin, 135(5), 731-748. PubMed 19702380.
- Morin, C. M. et al. (2006). "Psychological and behavioral treatment of insomnia." Sleep, 29(11), 1398-1414. PubMed 17162986.
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We are located at 441½ West Street in downtown Brantford. Free parking available, wheelchair accessible. Our team does not work on commission, so you get honest advice based on your needs.
Mattress Miracle , 441½ West Street, Brantford, ON · (519) 770-0001
Hours: Monday–Wednesday 10am–6pm, Thursday–Friday 10am–7pm, Saturday 10am–5pm, Sunday 12pm–4pm.