What does lack of sleep cause?

• Plateaus - You'll notice your weight loss will slow or stop completely. As well as muscle gains, the amount of weight you're lifting and stamina.
• Concentration - You have a harder time focusing on things. You're more likely to slack, daze off, and miss details.
• Stress Increases - You seem to be short all the time. You have a difficult time "dealing" with normal things in life.
• Poor Immunity - You start to catch colds/flus a little too often.
• Mood Swings - Doesn't take much to change your mood.
• Depression - Speaks for itself.
• Headaches - If you're having these daily, there's something wrong.
• Poor Memory - Whoops I forgot.