The sensation you're describing, where your feet or your whole body feel numb or disconnected, can be referred to as "numbness" or "tingling" in scientific terms. It is commonly associated with a condition called "paresthesia."

Paresthesia is an abnormal sensation that can manifest as numbness, tingling, or a "pins and needles" feeling. It often occurs due to temporary nerve compression or irritation. When you're sleepy or deeply concentrated on something, your body may be in a more relaxed state, and certain nerves may be affected, leading to this sensation of numbness or reduced awareness of your body's position.

One possible explanation for this phenomenon is related to sensory processing in the brain. When you're engrossed in a task or experiencing drowsiness, your brain may prioritize processing information related to the task at hand or focus on essential sensory input, while reducing attention to non-essential sensations. This selective attention may contribute to the reduced awareness of the position or sensations in your feet or body.

Additionally, when you're not moving much, blood flow to certain areas of the body may decrease, which can further contribute to the sensation of numbness or reduced sensory perception.

Occasional episodes of numbness or tingling during periods of concentration or sleepiness are generally normal. However, if you experience persistent or concerning symptoms, it's recommended to consult a healthcare professional for a proper evaluation and diagnosis.
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