Curiosty poll: I just read a question about the use of Tylenol PM?

For insomnia. I can't take Tylenol PM or Benadryl both keep me awake. If I take them I get restless energy. I also get irritable and nervous when I take codeine. Anyone else have these issues? Years ago I took them and they would make me drowsy but not anymore. Is it a tolerance? Wouldn't that tolerance go away after not taking them for years?