Paresthesia usually occurs when nerves are compressed or blocked for a certain period of time. This can happen when you:
Sleep with your hand under your head
Sit cross-legged for too long
Remain in the same position for an extended period
Changing your position usually restores normal sensation quickly.
Common Causes of Body Parts “Falling Asleep”
Several factors can lead to paresthesia. The most common causes generally fall into three categories:
Nerve compression
Circulation problems
Underlying health conditions
1. Nerve Compression
One of the most common causes is pressure on a nerve, which interrupts normal nerve signals.
This can happen 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 temporarily disrupts nerve communication between the affected area and the brain.
This results in:
Numbness
Tingling
The classic “pins and needles” sensation
2. Circulation Problems
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