Your CGM Is Lying at 3 AM
Imagine waking up at 3:12 AM to your phone screaming at you. đ¨
Your CGM says 54 mg/dL â.
Your heart starts pounding. You rush to the kitchen, grab orange juice, and treat the low as fast as you can.
Then morning comesâŚ
Your blood sugar is 260.
So what happened? đł
Hereâs the surprising possibility: that 54 may never have been real.
CGMs have completely changed diabetes management. They can reveal glucose spikes, overnight patterns, and trends you might otherwise never see. But thereâs something every CGM user needs to understand:
Your CGM can be wrong.
Sleeping on your sensor can create a compression low. Your glucose can change faster than your sensor can keep up. Heat, sweat, hydration, medications, sensor placement, and even accidentally bumping your sensor can sometimes affect what you see on the screen.
And that creates a dangerous dilemma:
Do you treat the number⌠or question it?
In this video, weâre uncovering 5 reasons your CGM may be misleading you and, more importantly, how to recognize when a reading deserves a second look.
Youâll discover why some nighttime âcrashesâ suddenly disappear, why your finger stick and CGM can tell two different stories, what those arrows actually mean, and why experienced clinicians pay attention to the shape of your glucose curve, not just one scary number.
Because a CGM is incredibly powerful when you know how to read it.
That mysterious 3 AM low might be telling you something completely different than you think. đ
Watch until the end before your next nighttime CGM alarm catches you by surprise.
âąď¸ CHAPTERS
00:00 â Intro & Hook
01:27 â How a CGM Actually Works
02:36 â Liar #1: Compression Lows, or Sleeping on Your Sensor
05:42 â Liar #2: High-Dose Vitamin C
08:50 â Liar #3: Hydroxyurea
10:29 â Liar #4: The First-Day Warm-Up
13:03 â Liar #5: Dehydration
14:59 â The 60-Second Real-vs-Fake Low Checklist
17:38 â When the Low Is Real: 3 AM Patterns You Should Not Ignore
19:32 â Other CGM Saboteurs
20:54 â Closure
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Reference for this video :
â˘â˘ Dexcom, Interfering substances hydroxyurea: https://www.dexcom.com/en-us/interference
⢠Cleveland Clinic Consult QD, Diabetes technology primer vitamin C/Libre; acetaminophen more than 4 g/day and hydroxyurea with Guardian Connect and Dexcom G6/G7: https://consultqd.clevelandclinic.org/diabetes-technology-a-primer-for-clinicians
⢠Abbott FreeStyle, Safety information vitamin C more than 1,000 mg/day: https://www.freestyle.abbott/us-en/safety-information.html
⢠CGM interfering substances table, including Libre 2 Plus/3 Plus and Medtronic Simplera hydroxyurea: https://pmc.ncbi.nlm.nih.gov/articles/PMC12531190/
⢠ADCES danatech, CGM interfering substances: https://www.adces.org/education/danatech/glucose-monitoring/continuous-glucose-monitors-cgm/cgm-selection-training/cgm-interfering-substancesâprocedures
⢠FDA labeling, Medtronic Guardian sensor acetaminophen: https://www.accessdata.fda.gov/cdrh_docs/pdf16/P160007S047c.pdf
⢠Dexcom, G7 vs FreeStyle Libre 3 warm-up times: https://www.dexcom.com/en-us/all-access/dexcom-cgm-explained/dexcom-g7-vs-freestyle-libre-3-and-libre-3-plus-choosing-the-right-cgm
⢠Journal of Diabetes Science and Technology, Compression artifact mechanism: https://journals.sagepub.com/doi/10.1177/19322968241267823
⢠PMC, Compression artifact during sleep: https://pmc.ncbi.nlm.nih.gov/articles/PMC10072139/
⢠PMC, User-reported false hypoglycemia alerts: https://pmc.ncbi.nlm.nih.gov/articles/PMC12357206/
â ď¸ Never ignore symptoms of hypoglycemia. If a CGM reading doesnât match how you feel or seems unusual, follow the confirmation and treatment instructions provided for your CGM and your healthcare professionalâs guidance.