To see a hammock in your dream implies that you need to take some time out for pleasure and leisurely activity. You need to relax!
To dream that you are lying in a hammock refers to your appreciation of life. You are taking the time to stop and enjoy life. Alternatively, the dream suggests that you have realised your goals. You have accomplished what you set out to do.
To dream that you fall off a hammock implies that you are being mislead into thinking that everything is okay when it is not. You are in for a rude awakening! Alternatively, falling off a hammock means that you still have some unfinished work to deal with.