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
If you want to go on a diet, you might want to have enough of sleep. The researches show that people who are on a diet and rests well, relatively lost more fat, of about 56% than those who deprived themselves to sleep. When you sleep well, your metabolism also works well, certain hormones will go up in your blood and drive your appetite.
Some people can recognize dreams while sleeping; this type of dream is called lucid dreaming. Most of the people would have experienced this type of dream atleast once in their life. You can actually control these dreams. One of the popular dreams that most of us experience is as flying in the sky; you can try lucid dream by imagining your house beside the flying aid.