Is it true that the Prophets and Imams spent the whole night in worship? If so, how can we follow this example without negative effects on our health?
Yes, it is true that the Prophet (SAWA) and Infallible Imams used to worship Allah for very long hours in the nights ( two thirds or half or one third of the night) and in special nights for the whole night.
We are not supposed to spend the whole night in worshipping and leave our responsibilities in studying and working , but need to spend some time in the night in worshipping Allah (SWT), thanking His Bounties and preparing ourselves for our real future (Aakhirah).
Wassalam.