Without sleep not only would you feel very tired, but you will be more prone to catch viruses and diseases. I’m sure we’ve all had times where we stayed up pass midnight or didn’t sleep at all, because the lack of sleep, you can find it hard to concentrate, keep your emotions together, and work. During a certain time frame at night, your organs are the weakest and your body is working to regenerate you.
I suggest researching on this as it can be incredibly interesting and help you understand the importance of sleep (you cannot survive without sleep, just like how you would die without food). But who knows, in the future there may be technologies that can help us not sleep all together but remain healthy!