1. Nerve Compression
One of the most common causes is pressure on a nerve, which interrupts normal nerve signals.
This can occur when you lie on your arm or hand during sleep or maintain a position that puts pressure on a nerve.
In reality, the body part is not actually “falling asleep.” Instead, the pressure prevents the nerve from sending signals properly to the brain, interrupting communication between the brain and the affected area.
This results in:
Numbness
Tingling
The classic “pins and needles” sensation
2. Circulation Problems
Circulation issues can also cause limbs to “fall asleep.”
If blood vessels become temporarily compressed or narrowed, the affected area may not receive enough oxygen and nutrients.
This leads to temporary numbness or tingling.
Once you move and restore normal blood flow, the sensation usually disappears quickly.
3. Health Conditions
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