Sleep Report - 12 Month WHOOP Analysis

Average sleep

5h 20m

Need 7-8 hours

Nights under 6 hrs

71%

251 of 354 nights

Low oxygen nights

41%

Below 95% SpO2

Recovery (green days)

9%

~3 days per month

How much you sleep

You sleep about 5 hours and 20 minutes per night on average.

7 out of 10 nights, you sleep less than 6 hours
Only 6 out of 100 nights, you get 7 hours or more
Your body needs about 7-8 hours to work properly

That is not enough. Your body does not get the time it needs.

Your blood oxygen drops at night

Your WHOOP measures the oxygen in your blood while you sleep.

On 4 out of 10 nights, your oxygen drops below the normal level
Normal is above 96%. Yours averages 95.1%
On some nights it goes as low as 90%

When blood oxygen drops during sleep, it is often because of a condition called sleep apnea. Your breathing stops briefly, many times during the night. You would not notice it, but your body does.

You snore. Your oxygen drops at night. These two things together are a strong sign you should get a sleep test.

Your body is not recovering

Your WHOOP gives a recovery score each morning. Green = recovered well. Red = did not.

32% Red

56% Yellow

9%

Most days, your body is still tired from the day before. Only about 3 days per month does it fully recover.

Your sleep quality is actually good

When you do sleep, your deep sleep and REM sleep are healthy for your age. The problem is not quality. You just need more of it. If you sleep longer, your body will use that time well.

What this means for your diabetes

Poor sleep makes diabetes worse.

When you sleep less than 6 hours, your body resists insulin more. Your medications have to work harder.

If you have sleep apnea, your blood sugar can be 0.5-1.5% higher on HbA1c from the apnea alone.

And because your body never fully recovers, your stress hormones stay high. High stress hormones raise blood sugar.

What to do

1

Get a sleep test (most important)

Ask your doctor at Geylang Polyclinic to refer you for a sleep study. Tell them your WHOOP shows your blood oxygen drops on many nights, and that you snore. If they find sleep apnea, there is a machine (CPAP) you wear at night that fixes it.

2

Go to bed earlier

You usually go to bed around 12:30-1:00 AM and wake up at 6:30 AM. That is only 5-6 hours. Try going to bed by 11:00 PM. Even 11:30 PM would give you 1 extra hour.

3

Keep wearing the WHOOP

It is giving us information we cannot get any other way. Keep wearing it so we can see if things improve.

Sleep Assessment Summary - Referral for Sleep Study

Prepared: 11 April 2026 | Data Source: WHOOP 4.0, continuous monitoring | Period: 19 Apr 2025 - 10 Apr 2026 (354 nights, 20 naps excluded)

Patient demographics

Age / Sex	62-year-old male
BMI	28.2 kg/m2 (82.5 kg / 171 cm)
Primary Dx	Type 2 Diabetes Mellitus, 24 years
HbA1c	9.2% (Jan 2026), down from 10.2%
CGM Time in Range	3.9% (iCan i6)
Blood Pressure	127/80 mmHg
Known Snoring	Yes (reported by family)
Alcohol	Nil
Kidney / Cardiac	No known disease

Current medications (7)

Drug	Dose	Route
Metformin	850mg BD	Oral
Glipizide	5mg QID (2 AM, 2 PM)	Oral
Empagliflozin (Jardiance)	25mg OD	Oral
Insulin Glargine (Toujeo)	16 units ON	SC
Dulaglutide (Trulicity)	3mg weekly	SC
Atorvastatin	20mg ON	Oral
Fenofibrate	300mg OD	Oral

Sleep duration

Metric	Value
Mean asleep duration	320 min (5.3 hrs)
Median asleep duration	321 min (5.3 hrs)
Range	106 - 611 min
Mean in-bed duration	390 min (6.5 hrs)
Nights < 6 hrs	251/354 (70.9%)
Nights < 5 hrs	140/354 (39.5%)
Nights ≥ 7 hrs	22/354 (6.2%)

Habitual bedtime ~00:30-01:00, wake ~06:30. Typical sleep window: 5.5-6 hours.

Sleep architecture

Stage	Mean Duration	% of Asleep Time
Light (N1/N2)	159 min	49.8%
Deep (SWS/N3)	78 min	24.4%
REM	83 min	25.8%

Architecture preserved. Deep sleep 24.4% is above age norms (10-15% typical at 62). REM 25.8% within normal range. Mean 70 min awake per night (18% of in-bed time).

Sleep efficiency and performance

Metric	Mean	Median
Sleep efficiency	82%	83%
Sleep performance	52%	53%
Sleep consistency	72%	74%
Nights with efficiency < 80%	114/354 (32.2%)

Sleep debt plateaued at system maximum (127 min) across the entire monitoring period - chronic unrecoverable deficit.

Nocturnal oxygenation (SpO2)

Metric	Value
Mean SpO2	95.1%
Median SpO2	95.2%
Minimum SpO2 recorded	90.0%
Nights < 95%	145/351 (41.3%)
Nights < 93%	26/351 (7.4%)
Nights < 90%	0/351

WHOOP reports average SpO2 per sleep period (not event-level oximetry). Despite averaging, 41.3% of nights fall below 95%. True nadir desaturation events are likely more severe.

Cardiovascular autonomic markers

Metric	Mean	Median	Range
Resting heart rate	72 bpm	71 bpm	63-94 bpm
HRV (RMSSD)	15 ms	14 ms	7-47 ms
Respiratory rate	15.5 rpm	15.4 rpm	14.1-17.3

HRV 15 ms is markedly below age-expected norms (20-40 ms for 60-64). Consistent with chronic sleep deprivation, poorly controlled T2D, and/or OSA.

Recovery (WHOOP composite score)

Zone	Frequency
Red (< 33%)	115/354 (32.5%)
Yellow (34-66%)	197/354 (55.6%)
Green (> 66%)	33/354 (9.3%)
Mean recovery	41%

Assessment

1. Chronic sleep deprivation - mean 5.3 hours over 354 nights, 71% below 6 hours. Habitual short sleep in the setting of poorly controlled T2D.

3. Autonomic markers - HRV 15 ms well below 5th percentile for age. Recovery < 33% on one-third of days.

4. Sleep architecture preserved - Deep and REM above age norms. Quality is not the primary issue. Insufficient sleep opportunity is the main problem, with possible OSA compounding.

Clinical questions for specialist

Does the SpO2 pattern warrant formal polysomnography or home sleep apnea testing (HSAT)?
Given autonomic depression (HRV 15 ms), is there value in concurrent autonomic function testing?
If OSA is confirmed, what HbA1c improvement can be expected with CPAP compliance in long-standing T2D?
Are there sleep hygiene or behavioral interventions to recommend alongside the current medication regimen?

Limitations

WHOOP is a consumer wrist-worn device, not a medical-grade polysomnograph. SpO2 values are session averages, not event-level desaturation data. Sleep staging uses accelerometer and PPG algorithms, not EEG.

That said, 12 months of continuous data across 354 nights provides a behavioral baseline not available from in-lab snapshots.

12-month sleep duration trend

Avg sleep (min) Avg SpO2 (%)

Monthly breakdown

Month	Nights	Asleep	Deep	Perf %	SpO2 %	HRV	RHR
2025-04	10	310m	81m	53%	94.5	24 ms	71
2025-05	31	331m	80m	54%	93.9	16 ms	73
2025-06	30	345m	87m	55%	94.7	14 ms	73
2025-07	31	307m	74m	50%	95.2	12 ms	74
2025-08	32	321m	81m	51%	95.1	12 ms	75
2025-09	29	290m	75m	46%	95.1	13 ms	72
2025-10	31	339m	77m	59%	95.5	15 ms	71
2025-11	31	314m	79m	50%	95.7	15 ms	72
2025-12	30	316m	75m	53%	95.1	15 ms	73
2026-01	31	299m	73m	48%	95.7	15 ms	72
2026-02	29	334m	82m	57%	95.0	15 ms	71
2026-03	29	326m	76m	51%	95.2	16 ms	72
2026-04	10	316m	74m	49%	95.5	15 ms	72

Sleep duration distribution

Under 5 hours

40%

140 of 354 nights

5-6 hours

31%

111 of 354 nights

6-7 hours

23%

81 of 354 nights

7+ hours

6%

22 of 354 nights

Sleep stages (average per night)

Light sleep

159m

49.8% of time

Deep (SWS)

78m

24.4% - above age norm

REM

83m

25.8% - normal

Awake

70m

18% of in-bed time

Autonomic health

HRV (avg)

15 ms

Normal: 20-40 ms at age 62

Resting HR

72 bpm

Range: 63-94 bpm

Resp rate

15.5

rpm - normal range

Avg SpO2

95.1%

Normal > 96%

What is sleep apnea?

When you sleep, the soft tissue in your throat relaxes and collapses, blocking your airway. You stop breathing - sometimes for 10 to 30 seconds at a time.

Your brain detects the danger, jolts you just awake enough to gasp and reopen the airway. You fall back asleep. It happens again. And again. This can happen 30 to 100+ times per hour, every night, and most people don't know it's happening.

Your throat is a floppy tube

Unlike your windpipe (which has hard cartilage rings), the back of your throat is made of soft tissue. When you're awake, muscles hold it open. When you sleep, those muscles relax.

Awake

Wide open

Muscles hold the airway firm

Snoring

Narrowed

Partially collapsed, air vibrates tissue

Apnea

Blocked

Fully collapsed, no air gets through

Think of a bounce house. When the air blower is running (you're awake), the walls stay firm and upright. When someone unplugs the blower (you fall asleep), the walls sag inward. In some people, they sag enough to block the entrance completely.

Anything that makes the "tube" narrower increases the risk: extra weight around the neck, a large tongue, a small jaw, or just getting older.

What happens to your body

Each time your brain fires the emergency "wake up and breathe" alarm:

Heart rate spikes - your heart suddenly beats faster
Blood pressure surges - vessels get strained
Stress hormones flood in - adrenaline, cortisol
Sleep is shattered - you never reach deep rest

The fire station that never rests. Imagine a fire station where the alarm goes off 50 times a night, every night. The firefighters never get real rest. The trucks wear out from constant start-stop cycles. Eventually the whole station breaks down. That's your heart and blood vessels with untreated sleep apnea - not damaged by one event, but by never getting a break.

Over years, this leads to high blood pressure, heart disease, stroke, and worse diabetes control.

How do you know you have it?

Loud snoring - often noticed by family first
Gasping or choking during sleep - waking up suddenly
Daytime exhaustion - tired even after "8 hours of sleep"
Morning headaches - from low oxygen overnight
You might not know - most people think they sleep fine

A sleep study (done at home or in a clinic) is the only way to confirm it. A doctor monitors your breathing, oxygen, and brain activity while you sleep.

What is melatonin?

Your brain has a tiny gland (the size of a grain of rice) that releases melatonin when it gets dark outside. It doesn't make you sleep. It signals to your body: "nighttime has arrived, time to wind down."

Melatonin is like a dimmer switch. When evening comes, your brain slowly dims the lights. The supplement just helps turn that dimmer when your body's own switch is getting rusty with age.

Melatonin myths

"It's a sleeping pill" - No. It's a gentle timing signal. It won't knock you out.
"More is better" - 0.5-1mg works as well as 10mg. Bigger doses aren't stronger.
"It helps sleep apnea" - No. Sleep apnea is a breathing/airway problem. Melatonin has nothing to do with breathing.

Taking melatonin for sleep apnea is like adjusting the clock on your wall to fix a clogged pipe. Different problem entirely.

What is a CPAP machine?

CPAP stands for Continuous Positive Airway Pressure. A small, quiet bedside device that gently blows air through a mask to keep your throat open while you sleep.

The machine

Small box

About the size of a lunchbox. Sits on your nightstand. Quiet as a fan.

The hose

Flexible tube

Connects machine to mask. Heated ones prevent condensation.

The mask

Nose cushion

Fits over nose (or nose + mouth). Modern ones are small and light.

How it works

    WITHOUT CPAP:

    Nose/Mouth --> Throat collapses --> X --> Lungs

    Soft tissue sags shut ... No air gets through

    WITH CPAP:

    Machine --> Gentle air pressure --> Throat stays open --> Lungs

    Like an invisible splint ... Air flows freely all night

Think of a tunnel made of soft fabric. Without air flow, the fabric sags and blocks the tunnel. The CPAP is like a gentle fan at one end that keeps just enough breeze flowing to hold the walls open all night.

Common concerns

"Is it uncomfortable?" - Takes a week or two to adjust. Modern masks are small - some just sit under your nose like a cushion.
"Does it actually help?" - Most people say they sleep better than they have in years. Partners love it because the snoring stops.
"Can I travel with it?" - Yes. Travel-sized ones exist, and airlines allow them as medical devices.
"Does it breathe for me?" - No. It just pushes regular room air to keep the passage open. Your lungs do their own work.

The full picture

    THE PROBLEM:

    Sleep --> Throat relaxes --> Airway collapses --> Oxygen drops --> Brain panics

    Repeat 30-100x per hour, all night, every night

    --> Heart strain, high blood pressure, exhaustion, long-term damage

    THE SOLUTION:

    CPAP machine --> Gentle air pressure --> Airway stays open --> Normal sleep

    Problem solved at the source

    MELATONIN:

    Helps with sleep timing (when you fall asleep)

    Does NOT help with sleep apnea (a breathing problem)

    Different problems, different solutions

What should you do?

1

Talk to your doctor

If you snore loudly, feel tired during the day, or your partner notices you stop breathing at night.

2

Get a sleep study

It can be done at home with a simple device. Painless and easy.

3

Try CPAP if prescribed

Give it 2 weeks. Most people adjust and feel much better.

4

Lifestyle helps too

Losing weight, sleeping on your side, and avoiding alcohol before bed can all reduce severity.