Narrated by `Abdullah bin `Amr:

The Messenger of Allah he said, “O `Abdullah! I have been informed that you fast all day and pray all night” I replied, “Yes, O messenger of Allah.” He said, “Do not do that! Observe the fast some days and do not fast on other days; stand up for the prayer at night and also sleep at night. Surely your body has a right over you, your eyes have a right over you and your spouse has a right over you."

Sahih al-Bukhari 5199 Notes: Health is such a great blessing bestowed by Allah upon His servants. One would find that health and wellbeing is more important than money and many other worldly possessions.

This can clearly be seen as there are many millionaires who would give up all their wealth to remove an illness, or many would sacrifice their wealth for a good night's sleep. The importance of health is highlighted by the hadith where the Prophet mentions that health is a blessing after iman (faith):

“You have not been given anything after the word of sincere faith like wellbeing, so ask Allah for wellbeing.” (Musnad Ahmad 11) Unfortunately the majority of people do not value their health nor give it its right until it is too late.

The Prophet said: “There are two blessings which many people squander: (They are) Health and free time.” (Sahih al-Bukhari 6412)

It is important to realise that the body is an amanah (trust) which Allah has entrusted to us, and to him all will return, and everyone will be questioned regarding the blessings they we given and how they used them.