When we used to be a kid, mom always used to convince us to get back to bed as early as possible, but we were notorious kids and never used to listen to her and play till the time she shout and scream loudly and say go to sleep, this is how I recollect this sentence.
Sleep is very much important in our life as during our day we perform lots of mental and physical tasks and at the end of the day, we get tired our energy levels go down and our capacity performs any particular task is reduced to a great extent, at this juncture we need to have a proper sleep for mind and body to rejuvenate that lost energy and get charged up for all the tasks.
On average as per the study conducted across varied age groups it's found that a newborn baby sleeps around 16 hours however as you get older you get to sleep and as you reach the elderly state it is reduced to 4-6 hours of sleep.
There are people who don't get sleep due to stress as well, which is quite worrisome as most of the time you are awake and that eats away lots of active time from your routine and you'll not be able to do even the simplest task efficiently.
The best remedy to have a sound sleep is to meditate and calm your mind from all though which will give you a good sleep.