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Posted by u/zoning_in_on_fitness··Question

What I Learned From Using a CGM During Sleep?

TL;DR: After tracking glucose levels overnight with a CGM, I found that caffeine affects my levels and might impact sleep quality. Curious about others' experiences with CGMs and sleep

I've been diving into the world of continuous glucose monitors (CGMs) recently, mostly for tracking my nutrition and how my body responds to different foods. But after some reading and personal experimentation, I decided to wear it during sleep for a week to see how my glucose levels fluctuate overnight. The results were really eye-opening.

First off, I noticed that my glucose levels tend to spike during the night. I usually thought my overnight fasting would keep things stable, but I saw some interesting patterns. For instance, on nights when I consumed caffeine too close to bedtime, my levels were all over the place. This definitely made me rethink my caffeine cutoff timing. I'm curious if anyone else has tracked their glucose levels during sleep and what insights you gathered?

Another aspect was the correlation with my sleep stages. I used a sleep tracker alongside the CGM, and I noticed that my REM sleep coincided with the most significant dips in glucose. It raised some questions about the role of glucose regulation in sleep quality. Could lower glucose levels during certain sleep stages be beneficial for recovery? I'd love to hear your thoughts on how these two metrics might interact.

Finally, the experience has made me consider the potential for CGMs as a tool for better sleep hygiene and recovery. Has anyone here experimented with CGMs or other wearables to track their sleep and recovery metrics? What have you learned from it?

I'm excited to share findings and discuss strategies to optimize sleep and recovery. Let's hear your experiences!

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u/fearlessfemale_99·

This post slaps! Seriously, i'm going to consider a CGM now. It's wild how something like glucose can impact everything. I'm all for tools that help improve my lifting game, so thanks for sharing!

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u/keto_lifter98·

No cap, I've been on keto for a while and tracking my glucose has been eye-opening. I see similar patterns when I eat certain snacks before bed. I think it's all about finding what works for you, but yeah, keeping an eye on glucose could help a lot!

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u/keto_lifter98·

This is so true! I've had nights where I couldn't sleep because I had a high carb meal too late. It's like my body was in overdrive trying to process everything. I think tracking glucose could help a lot of people avoid that same issue.

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u/creatine_supremacy·

Facts! I feel like hydration is overlooked, but it can really affect your workouts and recovery too. It's like the trifecta: sleep, hydration, and glucose. When one goes off, the others follow.

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u/6footdadbod·

I feel like a CGM might even help with my pre-workout meals. Like, if I know what spikes my glucose at night, I can adjust before I hit the gym. Who needs to guess when you can track, right?

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u/weekendwarrior88·

I think you might be onto something with the glucose dips during REM. I usually sleep like a rock after a workout, but if I eat late, I wake up feeling sluggish. I might look into a CGM to see if I'm missing something. It's a busy life, but sleep is non-negotiable!

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u/weekendwarrior88·

For real! I've been there where I thought I could just power through lack of sleep, but I hit a wall every time. The data could really help pinpoint what's off. I'm interested in hearing more about your findings.

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u/nurse_in_the_gym·

Great insights! As a nurse, I often see how diet impacts sleep quality. Caffeine can definitely disrupt sleep patterns and glucose regulation. It's fascinating that you observed a correlation with REM sleep. Lower glucose during REM could help with recovery, but I'd love to see more research on this.

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u/creatine_supremacy·

Honestly, my glucose spikes are a daily struggle. I thought I was eating healthy, but turns out I was just snacking on 'healthy' bars too late at night. Like, who knew those could mess with my sleep too? I guess it's all about balance.

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u/gymratbutchill·

This sounds super cool! I haven't used a CGM yet, but I track my sleep and recovery pretty closely. I noticed that after leg day, my sleep quality is worse, but I never connected it to glucose. Maybe I'll have to give CGM a shot to figure it out.

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u/zoning_in_on_fitness·

That sounds like a great plan! The data you gather could help pinpoint how to optimize both training and recovery. Plus, it could help you make better food choices before bed. What types of foods are you considering cutting out in the evenings?

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u/nurse_in_the_gym·

Absolutely! Sleep hygiene is so crucial for recovery. Lower glucose during REM could suggest your body is utilizing energy efficiently for repair processes. I'm all for leveraging tech to enhance sleep quality. Have you thought about combining this with tracking your hydration as well?

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u/zoning_in_on_fitness·

It's wild how interconnected everything is. I wonder if using a CGM would also help people realize their dietary triggers. Like, do you feel more fatigued when you have certain meals before bed? I'm thinking of trying a CGM just to experiment myself.

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u/gymratbutchill·

You should definitely try tracking it. I think more people need to realize how much sleep and nutrition affect our workouts. Plus, it's not just about lifting weights; it's about how we feel day to day!

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u/creatine_supremacy·

Honestly, I'm shocked caffeine affected your glucose so much. But it makes sense if you think about it. It can spike cortisol, which in turn might mess with your insulin response. Just another reason to ditch the coffee at night, huh?

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u/zoning_in_on_fitness·

That's really interesting to hear! I've been reading about how glucose levels can impact recovery and performance. Tracking sleep and glucose simultaneously could provide valuable insights. I'm curious if you've looked into how your diet during the day influences those night spikes? I'd be keen to hear more about that.

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u/mostly_lifting·

Dude, I'm not even trying to be dramatic, but it's all about that sleep. If I don't sleep enough, I don't lift well, and my food choices are all over the place. If I had a CGM, I'd probably see my glucose levels freaking out after a late-night Netflix binge.

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u/zoning_in_on_fitness·

This is super interesting! I've been using a CGM for a couple of months now, mainly for tracking my diet, and I noticed some similar spikes during the night too. I always assumed that sleeping would keep things stable, but it seems like factors like caffeine and even late meals can mess with that. Have you considered trying a different pre-bed snack? Maybe something lower in carbs to see if it smooths out your levels?

Also, regarding the dips in glucose during REM sleep, I wonder if it's linked to increased insulin sensitivity in that stage. There's some research that suggests our bodies might be better at processing carbs while we sleep, which could explain why your glucose dipped. If you have a chance, it might be worth looking into some studies on sleep and glucose regulation.

I'd love to hear more about your findings as you continue to experiment with this! Keep us posted.

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u/homegym_hustler·

Yeah, this makes sense. I'm a DIY home gym guy, so I often push myself hard, but if my sleep isn't right, I know I'm not recovering well. I might look into a CGM since I've got my workouts dialed in, and I want to keep improving.

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u/6footdadbod·

I tried a CGM once, and it was wild. I saw my glucose dip when I hit my 5K PR, but it shot up after a late-night snack. What surprised me was how much sleep and nutrition are intertwined. I might have to start tracking sleep again now that you mention this.

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