This is an action of closing yourself; it denotes self protection. It could indicate that the external environment is hostile and the dreamer needs shelter. Notwithstanding, it can also be interpreted as rejection of new opportunities around you.
Gallery of dreams
In most kids, lack of sleep can surely result to ADHD (Attention Deficit Hyperactivity Disorder), which is the opposite with the adults. Children between 7 and 10 who gets less than 8-hours of sleep every night will likely to become inattentive, impulsive and hyperactive. Their sleeping patterns can easily affect their brain.
If you want to be more creative today, that you were yesterday, it would be ideal for you to have enough rest and sleep. Your brain will be working overnight to consolidate your memories, making them stronger and making you organized and well-structured. Researches showed that people will have stronger emotional components, which could surely help with their creativity.