Endurance Feat + Mithril Heavy Armor: Mutually exclusive?

[Darksol the Painbringer]

Self-explanatory question.

How would the Endurance Feat stack up with say, for example, a Mithril Full Plate? By RAW, Would the Mithril Full Plate constitute as Medium Armor for the purposes of the Endurance feat, in that you can sleep in it?

[Winterwalker]

yes.