Crossword puzzle

Across

5. This is a sign of lack of sleep. This is when you are very moody and your mood keeps changing.

7. This is a very important activity. You need to do this for at least 9 hours in order to rest the body. 

8. This is caused by lack of sleep. This is when you are irritated easily. 

Down

1. This is a hormone produced by the stomach. When you are sleep deprived, the stomach creates more of this. 

2. It is a sickness. This is a condition where you cannot fall asleep. 

3. This substance can disturb your sleep. It is included in coffee and soda. 

4. This is a sign of sleep deprivation. This is when your are very drowsy. 

6. This is caused by lack of sleep. It is when you are overweight.