When I saw the title I was going to make that joke
Is it the whole hand, or just fingers? Badly fitting gloves or gloves with a big seam can restrict circulation a bit or slightly compress nerves. Does the hand feel clumsy at all? And does it hurt when the sensation comes back?
At the end of the day, I'd say go see a doctor. Loss of sensation isn't good but sometimes it's just a symptom of another problem.