✔ 最佳答案
Are you sure your feet aren't sweating from becoming too warm? But if that's not the case, it may be an involuntary nerve sensation such as the feeling of skin crawling. Try wearing thick socks to bed so that (1) your feet will be warm, and (2) the pressure and sensation of the fabric may give the nerves something to do so they don't have to generate signals that aren't there.
And please explain why you felt the need to make your post anonymous. I see this all the time from people posting the most mundane questions, such as what you posted, who switch it to anonymous as if they're trying to protect their already-anonymous online identity from shame or scrutiny.