Bathrobe of Supreme Leisure

This sable trimmed, blue and gold paisley bathrobe is enchanted to grant the wearer an unprecedented level of comfort. When worn to sleep, 4 hours is sufficient for a long rest and you gain 2d10 temporary hit points when you awaken.

Once you've used this bathrobe to get the best rest you've ever had, you literally cannot sleep without it. Unless you're wearing the bathrobe, you cannot benefit from a long rest for 1d4 days after your last long rest using the bathrobe.