Watchful Helm

(Requires Attunement)
While you wear this helm, you gain a +1 bonus to
AC and remain aware of your surroundings even
while you’re asleep, and you have advantage on
Wisdom (Perception) checks that rely on sight.
As a bonus action, you can cast the see invisibility
spell from the helm. Once this property of the
helm is used, it can't be used again until the next
dawn.