Sleeping is a basic human function and without it, we would be victims of fatigue. As the day drags on, our active energy levels begin to deplete and they begin to do so right from moment you wake up. You continue your daily activities which vary in the amount of energy that needs to be expended on them. For instance, if you spend your day taking it easy and relaxing, then the amount of energy you have spent would not be enough for you to merit turning in for sleep early as you still have plenty of drive left in you as compared to someone who has been out doing nothing but physical labour. They, in comparison, would probably go back to sleep or at least rest for a short span of time.
Sleeping is what allows them to regain their energy. Though there are other methods of it, such as drinking energy drinks, the only healthy and proper way to regain it is to rest off your fatigue in order to get ready for a new day. Even if you do not wish to sleep, your body will continuously remind you of your exhaustion and slowly begin to beg that you rid yourself of it. Another way to lull off the melody of sleep is to drink liquids that can give you a kick start like coffee. But this should only be done in times of need when there are things that need to be done and the time limit to do them is wavering.
But there are those that cannot sleep even when they want to. They might have problems in themselves or they simply just can’t get comfortable or find a good mattress. Those that suffer this can find tips on Twitter from @sleepadvisormag for sleeping advice.