A good night sleep is quite beneficial for a healthy body because when the mind has rested, the body functions better, your metabolism rate increases and your energy levels stay steady.
but with sleep deprivation comes a whole list of diseases that over time might cause serious health issues. For example after 24 hours of sleep deprivation, the risk of coronary diseases increases to upto four times and there are higher chances of strokes.
Also, obesity risks increases as your sleep deprived body craves food and metabolism decreases to a level where it is not able to digest all of the food that we eat and they in turn get stored as fat reserves ion our body.