Daily Punch 6-23-20 Ioun Stone of Lesser Health, Ioun Stone of Health, and Ioun Stone of Greater Health wondrous items for DnD 5e

I’ve been adding the fighter’s second wind to other games, so why can DnD have stamina points? How about an item that kind of makes them happen?

Lesser Health (Rare): When healed magically and you reach your maximum hit points, the additional healed hit points spill over into temporary hit points. You can gain a number of temporary hit points up to 1/4 your maximum hit points while this dull shiny sphere orbits your head. These temporary hit points are lost when you take a long rest.

Health (Very Rare): As per the ioun stone of lesser health, but you can have a number of temporary hit points equal to 1/2 your maximum hit points while this bright sphere orbits your head.

Greater Health(Legendary): As per the ioun stone of lesser health, but you can have a number of temporary hit points equal to your maximum hit points while this miniature star orbits your head.

Thoughts?