the healthiest
Health is not an adjective and therefore does not have comparative and superlative forms.Healthy, however, is an adjective, with the comparative form of healthier and the superlative form of healthiest.
Assuming you meant to ask about the word "healthy," the superlative is "healthiest."
healthier, healthiest
heathy
healthier, healthiest
healthier, healthiest
healthier, healthiest
well (healthy) comparative is better and superlative is the best
The comparative form of "healthy" is "healthier," and the superlative form is "healthiest." These forms are used to compare the healthiness of two or more subjects. For example, you might say, "She is healthier than her brother," or "He is the healthiest person in the group."
Sleep is a noun and does not have a superlative. Sleepy is an adjective and the superlative is "sleepiest."
The superlative for willing would be "most willing." There is no one-word superlative.
"Bib" is a noun and, as such, does not have a superlative form.