restles, tossing and turning, everything bothers you, lights, sounds, temp of the room, all these things interrupt what should be peace

you might want to sleep but you just cant no matter how hard you try, staying up for days and nights, till finally you cant function anymore

you brain finally stops, but for how long, with out drugs, you might sleep for two or three hours, then your body starts to misfunction

due to lack of rest you become ill, catching colds, or just fatigue on its on can cause some pain in your muscles.