What is the effect of Sauna for APOE4 carriers?
Phoenix has measured Sauna against 1 exact outcome for APOE4 carriers. Member #CBC9E3 rated sleep 7.8 on sauna days versus 5.8 on comparison days, a 2.1-point advantage after rounding.
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Sauna: what it changed, and what it did not
One intervention, every measured benefit and result that did not improve. See who it moved for, where it stayed neutral or went the other way, and the next hypothesis Phoenix can validate.
Phoenix APOE4 Research · Reviewed by Kevin Tran, APOE4/4 carrier and founder · Data through 2026-08-23 · How to read this research
How to read this
Observational research: real APOE4 carriers tracked over time, each compared with their own earlier self. Members chose their interventions, with no randomisation or placebo group. Everything else they changed is shown beside each result.
Read the full methods and limitsKey findings
Phoenix has measured Sauna against 1 exact outcome for APOE4 carriers. Member #CBC9E3 rated sleep 7.8 on sauna days versus 5.8 on comparison days, a 2.1-point advantage after rounding.
| Outcome | Direction | What we observed |
|---|---|---|
| Subjective sleep quality | Positive individual result | Member #CBC9E3 rated sleep 7.8 on sauna days versus 5.8 on comparison days, a 2.1-point advantage after rounding. |
Questions about Sauna
Does Sauna change Subjective sleep quality for APOE4 carriers?
Member #CBC9E3 rated sleep 7.8 on sauna days versus 5.8 on comparison days, a 2.1-point advantage after rounding. Support: 1 logged members, 1 members with repeats, 114 observations, 114 measurements.
What changed for real APOE4 carriers?
Search by health goal or intervention to see what changed for real members, including results that moved the wrong way.
Sauna · 3 outcomes shown.
Intervention categoryHabits
InterventionSauna
Sauna
HabitsOutcomes: 3Calm rating: Increase 1.64 points
Cases: 1
Context affected
Details
Member #093531's sauna days averaged 1.64 calm points higher, but sauna and breathwork often occurred together.
Sauna
?Collecting evidenceMember #093531's sauna days averaged 1.64 calm points higher, but sauna and breathwork often occurred together.
Little published human data on this link yet.
Selected member cases
- Phoenix memberAPOE4/462male+1.6points
Calm averaged 1.64 points higher on sauna days while breathwork often occurred alongside sauna.
What else changed and what to test next
What else changed: nearby starts included breathwork.
Next study: repeat Calm rating after a dated Sauna window.
- logged members
- 1
- members with repeats
- 1
- observations
- 1
Collecting evidence
No answer yet on Calm rating
Sauna is being tracked against Calm rating, but Phoenix has not yet published a ranked result for this exact question.
Every carrier who logs a dated start and a repeat test moves this page closer to an answer, including you.
Follow Sauna research.
Get an email when Phoenix publishes a meaningful update. At most one combined update each week.
Deep + REM sleep: Mixed result Mixed
Under review
Details
Wearable sauna analyses disagree: one analysis found deep plus REM lower in most of 15 members, and a larger verified set split nearly evenly.
Sauna
?Collecting evidenceWearable sauna analyses disagree: one analysis found deep plus REM lower in most of 15 members, and a larger verified set split nearly evenly.
Little published human data on this link yet.
- logged members
- 15
- members with repeats
- 15
Collecting evidence
No answer yet on Deep plus REM sleep
Sauna is being tracked against Deep plus REM sleep, but Phoenix has not yet published a ranked result for this exact question.
Every carrier who logs a dated start and a repeat test moves this page closer to an answer, including you.
Follow Sauna research.
Get an email when Phoenix publishes a meaningful update. At most one combined update each week.
This result is under review: The two wearable computations remain outside active ranking while Phoenix collects more verified nights.
Sleep quality: Increase 2 points
Cases: 1
Details
Member #CBC9E3 rated sleep 7.8 on sauna days versus 5.8 on comparison days, a 2.1-point advantage after rounding.
Sauna
✓Positive individual resultMember #CBC9E3 rated sleep 7.8 on sauna days versus 5.8 on comparison days, a 2.1-point advantage after rounding.
Little published human data on this link yet.
Selected member cases
- Phoenix memberAPOE4/437male
Sleep quality averaged 7.8 on 17 sauna days versus 5.8 across 97 comparison days.
What else changed and what to test next
What else changed: no nearby starts were recorded.
Next study: repeat Subjective sleep quality after a dated Sauna window.
- logged members
- 1
- members with repeats
- 1
- observations
- 114
- measurements
- 114
The Beat the Odds Study
The 43-page study: what members tried, how their bloodwork and wearable results changed, and what else changed alongside them.
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