text: hot then cold? when i am standing up i'm cold and when i lay down i get hot all over. i'm not covered up. just when i lay down or lean back i get hot. what could this be? does anyone know what it could be.  if you have any ideas let me know. i'm not sick i don't know what it could be, but to prevent it, wear sweaters and such when you intend to stand for awhile, and simply wear underwear or shorts and a tanktop to bed with a fan/ac blowing on you for sleeping.