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19 October 2026Better sleep is one of the most rewarding wellness goals, and research suggests that cold, red light and gentle warmth can each support it. Studies report deeper slow-wave sleep after cold sessions, higher melatonin after nightly red light, and faster sleep onset after a warm bath before bed. This guide shares five powerful ways to get better sleep, what each study measured and how to build a calm evening routine around them. Explore the full range on Aeva’s technology page.
Table of Contents
Why Better Sleep Matters
Sleep is when your body rebuilds. Deep, slow-wave sleep supports physical recovery, and a steady supply of melatonin helps set your body clock. When you sleep well, you tend to feel calmer, think more clearly and recover faster from busy days and hard workouts.
That is why so many people look for ways to improve sleep without relying on pills. The studies below explore gentle, non-invasive options, and they are encouraging for anyone who wants better sleep as part of a balanced routine.
Better Sleep at a Glance
- Cold: about 7 more minutes of slow-wave sleep per night after five daily cold sessions in healthy adults.
- Training: elite swimmers using daily cold sessions avoided the sleep loss seen without them during intensified training.
- Light: elite basketball players using red light nightly for 14 days improved sleep quality and melatonin.
- Warmth: a warm bath or shower 1 to 2 hours before bed helped people fall asleep about 10 minutes sooner on average.
1. Cold Sessions for Deeper Sleep
Deep sleep is where much of the body’s repair happens. In a randomised 2024 study, 20 healthy adults completed five consecutive daily cold sessions of five minutes at −90°C. They gained about 7 more minutes of slow-wave sleep per night and reported better perceived sleep quality.
The same study found better mood and lower anxiety, with larger gains in women. Sleep efficiency and night waking did not change, so the benefit was specific to deep sleep and how rested people felt. The result was summarised by the International Institute of Refrigeration. Read more in our whole body cryotherapy guide.
Source: Arc-Chagnaud et al., Cryobiology, 2024.
2. Better Sleep During Hard Training
Athletes often lose sleep when training load climbs. In a randomised crossover trial, 10 elite synchronised swimmers completed two 2-week periods of intensified training, with or without daily whole body cryostimulation.
Without the cold sessions, swim speed and physiological markers declined, sleep quantity fell and fatigue rose. With them, no significant changes occurred, so the authors concluded the sessions helped limit functional overreaching. It is a good example of better sleep and better recovery going hand in hand. See our guide to cold recovery for athletes.
Source: Schaal et al., Medicine and Science in Sports and Exercise, 2015.
3. Red Light and Melatonin
Melatonin is the hormone that signals night to your body. In a Journal of Athletic Training study, 20 elite female basketball players were split into two groups. Those given 30 minutes of whole-body red light every night for 14 days improved sleep quality, serum melatonin and 12-minute run performance compared with the placebo group.
It is a small study in elite athletes, so results may differ for others, but it gives a clear picture of how light may support better sleep. See red light therapy benefits for the wider research.
Source: Zhao et al., Journal of Athletic Training, 2012.
4. Warmth Before Bed for Better Sleep
Warmth has the broadest sleep evidence of all. A meta-analysis by Haghayegh and colleagues screened 5,322 articles, identified 17 qualifying studies and pooled data from 13. A warm bath or shower at about 40 to 42.5°C, taken 1 to 2 hours before bed, helped people fall asleep about 10 minutes sooner on average and improved self-rated sleep quality and sleep efficiency.
Those studies used baths and showers, which is a simple form of passive body heating, rather than a hyperthermia device. They help explain why so many people find warmth deeply relaxing. For the controlled option at Aeva, see hyperthermia in Kuala Lumpur.
Source: Haghayegh et al., Sleep Medicine Reviews, 2019; summary by Neuroscience News.
5. Habits That Protect Better Sleep
Technology works best on top of good habits. These simple steps support better sleep every night:
- Keep a regular bedtime and wake time, even at weekends.
- Dim the lights and put screens away in the last hour before bed.
- Keep your bedroom cool, dark and quiet.
- Limit caffeine late in the day and avoid heavy meals close to bedtime.
- Get daylight and gentle movement during the day.
If you often struggle to sleep, speak to your doctor, as persistent sleep problems deserve proper advice.
Study Snapshot: What Each Trial Measured
| Approach | Who took part | What they did | What was reported |
|---|---|---|---|
| Cold | 20 healthy adults | Five daily sessions, five minutes at −90°C | About 7 more minutes of slow-wave sleep; better perceived sleep |
| Cold | 10 elite swimmers | Daily sessions in two weeks of intensified training | No sleep or speed decline versus a decline without |
| Red light | 20 elite basketball players | 30 minutes nightly for 14 days | Better sleep quality and melatonin |
| Warm bath or shower | 13 studies pooled | 40 to 42.5°C, 1 to 2 hours before bed | Fell asleep about 10 minutes sooner |
A Calm Evening Routine for Better Sleep
A simple wind-down makes better sleep easier to repeat. Try this rhythm:
- Finish caffeine and heavy meals early in the evening.
- Take a warm bath or shower 1 to 2 hours before bed.
- Dim the lights and switch off screens.
- Write tomorrow’s to-do list so your mind can switch off.
- Go to bed at the same time each night.
Daytime recovery sessions complement your evening routine, and our guide to a weekly longevity routine shows how to combine them.
Building Better Sleep Into Your Week
Studies used repeated sessions, from five consecutive days of cold to two weeks of nightly light, so consistency is the key. At Aeva, cold sessions last about three minutes at around −110°C and red light sessions about 20 to 30 minutes, so they fit easily into a busy week. Our team will suggest a rhythm around your schedule.
Keep a short sleep diary for two weeks, noting bedtime, wake time and how rested you feel, so you can see what works. Research on combining technologies is still emerging, so add them gradually and listen to your body. A quick chat with your doctor helps if you have a health condition or take medication. The friendly team at Aeva Longevity Centre is happy to help you plan through the contact page.
Who May Enjoy These Options
People who want better sleep come from many walks of life, and the research above suggests a few groups who may find these options especially appealing:
- Busy professionals who want a calm, structured way to unwind after demanding days.
- Active people and athletes who want sleep and recovery to support each other during heavy training weeks.
- Anyone building healthy routines who enjoys adding simple, enjoyable habits to the evening.
Most people notice the experience itself is relaxing, with a pleasant feeling of calm afterwards. Treat every approach as one part of a wider routine, and give each new habit a couple of weeks before judging how it works for you.
Related Reading
- Whole body cryotherapy: the complete guide
- Whole body cryotherapy in Kuala Lumpur
- Red light therapy benefits
- Hyperthermia in Kuala Lumpur
- Build a weekly longevity routine
- Support glowing skin with red light and oxygen
- More longevity insights from Aeva
FAQ
What helps with better sleep?
Research links cold sessions with more slow-wave sleep, nightly red light with improved sleep quality and melatonin, and a warm bath before bed with falling asleep about 10 minutes sooner. Regular sleep habits are the foundation.
How long until I notice better sleep?
The studies ran from five consecutive days to two weeks, so many people look for changes within a couple of weeks of a consistent routine.
When should I take a warm bath for better sleep?
The meta-analysis found the best results when a warm bath or shower at about 40 to 42.5°C was taken 1 to 2 hours before bedtime.
Can I combine cold and red light for better sleep?
Many people do. Research on combinations is still emerging, so our team suggests a plan around your goals and adds technologies gradually.
How long are the sessions?
Cold takes about 3 minutes, red light about 20 to 30 minutes and hyperthermia about 45 minutes, plus screening and cooling time.
Are these options suitable for everyone?
Most healthy adults can enjoy them. If you have a health condition, take medication or are pregnant, speak to your doctor first.
Sources
- Arc-Chagnaud C et al. Effects of repeated cryostimulation exposures on sleep and wellness in healthy young adults. Cryobiology, 2024.
- International Institute of Refrigeration. Cryotherapy may improve sleep quality and mood. December 2024.
- Schaal K et al. Whole-body cryostimulation limits overreaching in elite synchronized swimmers. Med Sci Sports Exerc, 2015.
- Zhao J et al. Red light and the sleep quality and endurance performance of Chinese female basketball players. J Athl Train, 2012.
- Haghayegh S et al. Before-bedtime passive body heating by warm shower or bath to improve sleep: a systematic review and meta-analysis. Sleep Med Rev, 2019.
- Take a warm bath 1 to 2 hours before bedtime to get better sleep. Neuroscience News, 2019.
General information only, not medical advice. These technologies support wellness and do not replace medical care. Speak to your doctor if you have a health condition or ongoing sleep problems.