Fill in the gaps using suitable words:

We all know what a dream is. Generally we dream during our sleep. Some dreams are sweet or (a) —-- When we dream something extremely bad, we call it a (b) ——-. Dreams have no (c)——- -. They are soft and (d) ——. The dream we have during the day time is called (e) ——-. Dreams have fascinated philosophers for thousand of years, but none could (f) ——- specifically what dream actually is. Dreams can be extraordinarily (g) ——- or very vague. While many theories have been proposed, no consensus has emerged. It is important to consider that science is still (h) ——- the exact purpose and function of sleep itself. Some researchers suggest that dreams have no (i) ——- purpose, while others believe that (j) ——- is essential to mental, emotional and physical well-being.