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If a character is restrained or unconscious/sleeping do they lose any bonus from dexterity for armor class and dexterity saves?

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AC calculations do not change, however you do automatically fail strength and dex saves (PHB 292).

AC calculations do not change based on your state of consciousness or other conditions. You will grant advantage on attacks, but your armor calculations don't change.

This is likely for ease of use rather than any kind of mechanical simulation.

Generally, AC calculations are something you do once when you level up (generally it only changes if you get an ability increase related to ac or take a feat so that's pretty obvious) or get new gear and do not change (though as a commenter points out you may need to keep a record of your unarmored ac if your DM plans to gank you in your sleep). Unless something specifically grants a bonus/penalty, AC is going to be constant.

With the automatic failure of dex/str saves, you don't have to worry about any bonuses to those saves, you simply fail them.

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  • \$\begingroup\$ Regarding Restrained, "The creature has disadvantage on Dexterity saving throws." (PHB, p. 292) Unconscious is auto-fail. I missed it the first time! Feel free to just point to Appendix 1: Conditions for saving throw information. \$\endgroup\$ – sadaqah Jan 20 '15 at 22:34
  • \$\begingroup\$ Actually you should not calculate it when you level up. But each time you change armor. If you have a plate armor, you probably don't sleep with it... (you could lay down with it, but sleep? Hmmm...) and it takes you a good minute to put it back on. \$\endgroup\$ – Alexis Wilke Jan 21 '15 at 5:56
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    \$\begingroup\$ @alexis there are several things at level up that can alter ac so its a good idea to check it. Gear is accounted for in the answer. And i added a note re: unarmored ac for when dms gank you in your sleep \$\endgroup\$ – wax eagle Jan 21 '15 at 10:40

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