It usually starts in the middle of the night. You wake up with a strange, unsettling feeling in your hand—either completely numb or buzzing with sharp, electric tingles. It feels like your limb has “fallen asleep,” a harmless annoyance most people ignore. But this sensation, known as paresthesia, is your body sending a signal that something has been temporarily disrupted.

Most of the time, the cause is simple pressure on nerves or restricted blood flow. Sleeping on your arm, bending your wrist, or staying in one position too long can “pinch” the nerves and limit circulation. When oxygen supply drops, the nerves stop sending normal signals. Once you move again, the sudden return of blood flow creates that familiar pins-and-needles feeling as everything resets.

Occasional numbness is usually not dangerous, but frequent episodes can point to deeper issues. Conditions like carpal tunnel syndrome can compress the median nerve in the wrist, especially at night. In some cases, diabetes-related nerve damage or spinal problems may also cause repeated tingling or weakness in the hands.

To reduce the problem, small changes help. Avoid tight clothing or wrist pressure during sleep, improve posture during the day, and take breaks from repetitive hand movements. If numbness becomes frequent, lasts long, or comes with weakness, it is important to get it checked, as persistent nerve issues should not be ignored.