Browse by exact outcome

Deep plus REM sleep: every measured intervention

Ranked only against the same measurement, in the same unit. See the positive, neutral, opposite-direction and still-collecting evidence before deciding what is worth your own test.

Research issue
Issue 01
Data through
2026-08-09
Evidence map version
v1.1.0
Explore the evidence Get the Evidence Map

How to read this

Phoenix research is longitudinal and observational: we follow real APOE4 carriers over time and compare each member with their own earlier self, with no placebo group, no randomisation, and members choosing their own interventions.

That means these are strong signals pointing at what to test next, not proof of cause. Most nutrition, supplement and lifestyle research you read online has exactly the same design. The difference is that we say so, and we show you the confounders.

Read the full methods and limits

What the Phoenix community is measuring

Browse exact outcomes and interventions. Each result keeps its source, measurement rule and audit record beside the claim.

Get the PDFJoin Phoenix in 7 minutes Open inside Phoenix

Sleep

Keep total duration, sleep stages and subjective sleep ratings separate.

Most promising

Deep plus REM sleep

Verified wearable deep and REM sleep stages · Aim: higher

Sleep mask

✓Repeated positive

One curated case had 134 more deep-plus-REM minutes; the 11-member ten-tag-day cohort averaged about 17 more minutes and stayed positive at every floor.

Selected member cases

  1. Fine Tuner · APOE3/4 · female · age 50-59

    Sleep-mask nights carried 134 more minutes of deep plus REM sleep under independent recomputation.

    What else changed: no nearby starts were recorded.

    Next study: repeat Deep plus REM sleep after a dated Sleep mask window.

1 selected member case · not a response rate

Logged members
19
Members with repeats
11
Observations
1
Sources and context

Members with a sleep-mask tag and verified wearable stages, evaluated at named minimum tagged-day floors.

  • report-lines-343-412, reviewed by independent verifier

1 selected case shown with this evidence.

Earlier bedtime

✓Repeated positive

Three curated earlier-bedtime cases carried part of their longer sleep in deep plus REM stages; exact group-stage counts are not published.

Selected member cases

  1. Deep Diver · APOE4/4 · female · age not disclosed

    Deep plus REM sleep carried about 43 minutes of her earlier-night advantage.

    What else changed: no nearby starts were recorded.

    Next study: repeat Deep plus REM sleep after a dated Earlier bedtime window.

  2. Night Shift · APOE3/4 · female · age 50-59

    Deep plus REM sleep carried 33 to 53 minutes of her earlier-night advantage.

    What else changed: no nearby starts were recorded.

    Next study: repeat Deep plus REM sleep after a dated Earlier bedtime window.

  3. Omega Lifter · APOE4/4 · male · age 40-49

    Deep plus REM sleep carried roughly half of his 73-to-93-minute earlier-night advantage.

    What else changed: no nearby starts were recorded.

    Next study: repeat Deep plus REM sleep after a dated Earlier bedtime window.

3 selected member cases · not a response rate

Observations
3
Nights
53
Sources and context

Curated earlier-bedtime cases with verified wearable sleep-stage data.

  • report-lines-343-412, reviewed by independent verifier

3 selected cases shown with this evidence.

ZenoWell taVNS

✓Repeated positive

Two curated ZenoWell cases carried 44 and 23 more deep-plus-REM minutes on use nights; five of 40 study members had valid wearable coverage.

Selected member cases

  1. Current Convert · APOE4/4 · female · age 60-69

    Use nights carried 44 more deep plus REM minutes across 60 use and 91 non-use nights.

    What else changed: no nearby starts were recorded.

    Next study: repeat Deep plus REM sleep after a dated ZenoWell taVNS window.

  2. Signal Seeker · APOE3/4 · female · age 50-59

    Use nights carried 23 more deep plus REM minutes across 77 total nights.

    What else changed: no nearby starts were recorded.

    Next study: repeat Deep plus REM sleep after a dated ZenoWell taVNS window.

2 selected member cases · not a response rate

Logged members
40
Members with repeats
5
Observations
2
Nights
228
Measurements
228
Sources and context

Device-study members with real wearable data on logged use and non-use nights; placeholder rows are excluded.

  • report-lines-414-430, reviewed by independent verifier

2 selected cases shown with this evidence.

No clear change

Deep plus REM sleep

Verified wearable deep and REM sleep stages · Aim: higher

Untimed caffeine or coffee

—Neutral result

Untimed caffeine and coffee tags showed no deep-plus-REM pattern, unlike the explicitly timed morning-caffeine tag.

0 selected member cases · not a response rate

Sources and context

Members with untimed caffeine or coffee tags and verified wearable sleep-stage data.

  • report-lines-343-412, reviewed by independent verifier

What may work against

Deep plus REM sleep

Verified wearable deep and REM sleep stages · Aim: higher

Morning caffeine

↘Opposite direction

Deep plus REM sleep was 3 minutes lower at one tagged day and 8 minutes lower among 24 members with at least ten tagged days.

Selected member cases

  1. Current Convert · APOE4/4 · female · age 60-69

    Morning-caffeine days carried 111 fewer minutes of deep plus REM sleep.

    What else changed: no nearby starts were recorded.

    Next study: A placebo-controlled crossover found dose and clock time mattered, supporting explicit dose-and-time capture instead of one blanket caffeine label.

  2. Fine Tuner · APOE3/4 · female · age 50-59

    Morning-caffeine days carried 82 fewer minutes of deep plus REM sleep while felt sleep was unchanged.

    What else changed: no nearby starts were recorded.

    Next study: A placebo-controlled crossover found dose and clock time mattered, supporting explicit dose-and-time capture instead of one blanket caffeine label.

2 selected member cases · not a response rate

Logged members
43
Members with repeats
24
Observations
2
Sources and context

Members with a morning-caffeine tag and wearable sleep, evaluated at separate minimum tagged-day support floors.

  • report-lines-343-412, reviewed by independent verifier

2 selected cases shown with this evidence.

Not yet measured

A placebo-controlled crossover found dose and clock time mattered, supporting explicit dose-and-time capture instead of one blanket caffeine label.

How to test it

Baseline
Record caffeine-free wearable nights before the timed exposure block.
Duration
14 days
Adherence
Log dose and clock time while wearing the device every night.
Retest
Compare deep plus REM sleep after the two-week tagged block.
Falsifier
Timed caffeine tags do not reproduce lower deep plus REM sleep as dose or proximity to bedtime increases.
Eligible-member target
40 members

Training and workouts

↘Opposite direction

Across 32 members with at least ten workout tags, workout nights averaged about 11 fewer deep-plus-REM minutes.

0 selected member cases · not a response rate

Logged members
32
Members with repeats
32
Sources and context

Members with at least ten workout tags and verified wearable deep-plus-REM data.

  • report-lines-460-507, reviewed by independent verifier
  • report-lines-559-604, reviewed by independent verifier

This result was withdrawn: An earlier plus-42-minute workout line reversed direction under independent recomputation.

Audit history

These historical records remain beside the current evidence so you can see why their status changed.

Deep plus REM sleep

Sauna

!Record under review

Wearable sauna analyses disagree: one wearable analysis found deep plus REM lower in most of 15 members; a corrected larger set split nearly evenly.

0 selected member cases · not a response rate

Logged members
15
Members with repeats
15
Sources and context

Members with sauna tags and corrected verified wearable sleep-stage coverage under each analysis version.

  • report-lines-559-604, reviewed by independent verifier

This result is under review: The two wearable computations remain visible and excluded from active ranking while Phoenix collects corrected nights.

Keep the map

Take every result into your next experiment.

Get the Issue 01 Evidence Map by email. It groups the same evidence by outcome and by intervention, including what worked, what did not, and what Phoenix wants to test next.

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Turn evidence into your next test

Magnesium and homocysteine is 7 members from an answer.

Forty carriers with a dated start and a repeat blood test close it. Creatine, vitamin D3 and B12 sit further back. Your next blood test is somebody else's answer, and theirs is yours.

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