A foot falling asleep is caused by pressure on nerves that reduces their ability to transmit signals. The numbness is the nerve pathway being compressed or blocked. The tingling sensation that follows when the pressure is released is not the problem but the recovery: the nerves firing back up in a disorganized rush as normal transmission resumes. The experience is similar in principle to a traffic jam clearing, with signals that have been held up suddenly moving again in an irregular burst.
Daniel and Mom examine what nerves do normally, how pressure disrupts their signaling, why the numbness happens before the tingling, and why the tingling feels the way it does. The episode closes on Mom’s instruction that Daniel has apparently not followed.

Daniel is nine. He asks the questions, refuses to accept easy answers, and picks every episode topic himself.

Mom does the digging - finding the sources, checking the claims, and translating them into something a nine-year-old will actually sit still for.
A foot falling asleep happens when pressure blocks nerve signals from reaching the brain normally.
The numbness is the blocked signal. The tingling is the nerves firing back up when pressure is released.
The tingly sensation is the recovery, not the problem. It signals the pathway is reopening.
The experience is similar to a traffic jam clearing: held-up signals move again in an irregular rush.
“The tingly part isn't the problem. It's the messages firing back up in a mixed-up rush when my foot wakes back up.”