Not a doctor, but I do suffer from thoracic outlet syndrome. Numbness after sleeping or while using a phone was one of the only symptoms I got before my blood clots.

Sometimes this would be the full arm and sometimes just in the ulnar nerve (outside of palms and pinkie + ring finger).

Maybe try doing the roos stress test at home and talking to a doctor if you get symptoms. If left untreated you may end up with permanent venous and/or nervous system damage (like me).

Obviously this isn't the only thing that can cause numbness in your arms after sleeping. I'm just spreading the word on TOS because it's what I'm familiar with, and because I wish someone had done so for me years ago!

Change the way you sleep.

I once spent nearly a year without enough sleep because I'd wake up in the middle of the night with my hands so numb that they hurt, which is a weird feeling. I'd have to sit up and lean forward shaking my hands until the feeling came back, then lay back down and try to sleep only to be woken up again 30 minutes later. It nearly drove me insane. Even taking sleeping aides didn't stop the pain from waking me up.

It didn't know why until one night for reasons I still don't know, I threw my pillow aside and rolled a t-shirt up to stick under my neck, so that my head could lean back instead of propping it up and forward. I slept for 10 hours straight and my hands didn't go numb the entire time. I figured it was a pinched nerve that I finally released the pressure by sleeping with my head leaned back. Since then I've found a small pillow that fits nicely under my neck. I haven't had an incident ever since.

It's not worth the pain and sleepless nights. Just change the way you sleep and stop torturing yourself.

Surgical tech here (bottom of the medical food chain, so take that for what it's worth [not shit]). Adding to the chorus of "ASK YOUR DOCTOR!!!" bc words from anonymous internet strangers are trash.

...but if it instills a sense of urgency: I've helped with a couple of arm amputations from patients falling asleep on them and cutting off blood circulation to the extent that the tissue dies. Iirc, both of those involved longer-than-normal periods of sleeping on it due to drugs - unsure if there's any risk of that from a normal sleep schedule. But yeah, the various chunks that make up you all need oxygen to do their thing; depriving those chunks of oxygen generally leads to not-so-great outcomes.

I’m not a doctor, but I do experience the same thing. I recently saw a doctor for wrist pain, and was eventually diagnosed with cubital tunnel syndrome, and was told to use an elbow brace when sleeping.

I can say that using the elbow brace has helped slightly with the wrist pain, and it does result in me no longer waking up with numbness.

The brace keeps your arm straight, and forces me to sleep in a way where there’s no/very little pressure put on my elbow.

Highly suggest you see a doctor, but if you can’t, look into elbow braces (they are affordable). But please get a professional opinion.

I never thought about this but this happens to me occasionally. I often put my arm under my head and pillow for support and comfort. Maybe once every couple weeks I'll wake up and it's numb or fully asleep.

I don't have an answer but I'm 34, this has been happening my whole life, and I haven't noticed any issues.

Numbness from putting weight on something usually means you are restricting blood-flow.

Generally harmless, doing so for 9 hours every night could eventually lead to atrophy of the limb.

Try to mix up your sleeping arrangement to not sleep with the full weight of your body on your shoulder all night every night.

We are talking 8 hours a night for years to have any lasting impact, unless you have something like diabetes, where the nerve damage will occur faster.

Don't panic, just try to change your sleeping position/sleeping surface.

If you deprive body parts of oxygen for long enough, I suppose it's possible but practically speaking it seems unlikely.

I would agree with BroqueInMind though: Talk to your doctor, if nothing else but for reassurance from someone who has spent serious time learning about the human body.

I am not a doctor.

If the numb arm is causing you to wake up then, yes, you should adjust your sleeping position. Not because of your arm but because sleeping well is important.

What you are experiencing is called obdormition (the limb falling asleep) and paresthesia (the pins and needles feeling when it wakes up again). I'm 36 and it happened countless times to me, no ill effects.

I've had this same problem and developed some nerve damage/chronic pain. Took a few months of sleeping with better posture (yes its really hard to change at first), and it recovered.

I did see a doctor that confirmed the issue, did an x-ray and recommended posture change.

IANAD, but if it's causing you stress, bro just change your sleeping position, buy one of those gimmick mattresses that specifically has slots for your arm to fall into (like the SONU Sleep System), or just use a buttload of pillows.

Consult a doctor first if that's cheaper than buying a whole new mattress.

IANAD

But: that feeling is from lack/loss of blood flow through your limb. Limbs kinda need blood to survive. (well, oxygen from your blood...)

Probably not gonna kill ya, but I doubt it's good for you either.

Not sure if mentioned yet. But this started happening to me a few months back. I talked to my physician and he immediately suspected vitamin B12 deficiency. Which, after a blood test, turned out to be correct. 5 vitamin shots later (1 per week) and the problem was gone pretty much instantly.