Is a premium, softer mattress worth the extra money?

Innkeepers around Hyrule offer the option of a 'Soft Mattress' at double the price. When asked the difference though, they reveal themselves to be singularly untalented salespeople, rambling about the bed being stuffed with 'premium cucco feathers' that will leave Link 'more energized'.

Money is tight, so I haven't bothered to try it out. What good is a Soft Bed?

A soft bed grants you an extra heart temporarily.

The IGN Wiki for the Highland Stable states:

...depending on your room choice (a soft bed gets you an extra temporary heart).

This GameFAQs forum says the same, and also states that in Zora's domain, there is a water bed that grants 3 hearts, and a full extra stamina bar:

And if you reach Zora's Domain, they have a water bed that gives you 3 extra hearts and a full extra stamina bar for 80 rupees a stay.