Optimal Brain Function — Adequate sleep is essential to your brain’s ability to learn, memorize, and adapt to new input.
Increased Stamina and Better Performance  —  Getting enough sleep increases the amount of time it takes before you become exhausted. Continuous lack of sleep can lead to sleep deprivation. This can cause you to become easily exhausted throughout the day, especially after activities such as exercising and studying.
Strengthened Immune Functions — According to a CDC study of shift nurses, sleep deprivation inhibits the activity of Natural Killer (NK) cells, which are vital to fighting tumor growth. It also triggers the generation of inflammatory cytokines and makes you more susceptible to infection. Adequate sleep helps keep your immune system active and working properly.
Heightened Creativity — Sleep deprivation impairs divergent or creative thinking on all levels. When you get the rejuvenating sleep you need, you’re better equipped to think creatively while you’re awake. 
Lower Stress Levels — Without adequate sleep, your stress levels are likely to rise. In turn, higher stress levels can make it more difficult to sleep easily and soundly, causing the stress-sleep cycle. With proper rest, your stress levels are easier to control, helping you sleep better and making you less likely to wake up stressed. 
Improved Daytime Performance and Safety — Occupational incidents become over twice as likely when workers are sleep deprived. This can be attributed to sleep deprivation’s ability to impair decision making and reaction time. Quality sleep allows you to stay safe at work by empowering you to make better decisions and react more effectively.

Better Weight Regulation — Sleep deprivation has been well documented as a contributing factor to obesity. Getting enough sleep helps regulate the hormones that control hunger and satisfaction. Proper sleep also gives you the energy you need to exercise, regulates your body temperature, and may make you less inclined to eat sugary, calorie heavy foods.  
Longevity — Because adequate sleep protects you from disease, gives you energy, keeps your stress levels down, and helps you pay attention, sleeping right every night makes you more likely to live longer.