Threesome - To dream that you are involved in a threesome indicates that there is a missing component in your sex life. Pay attention to the gender of the participants in the threesome. If mostly female, then the dream implies that the missing component may pertain to some emotional aspect of sex. If mostly male, then the dream implies that some physical aspect of sex is lacking. Note that the dream does not necessarily mean that you want a threesome in your waking life.

Dwarf - To see a dwarf in your dream suggests that you are well-grounded and connected to nature and the earth. Alternatively, a dwarf may mean an aspect of yourself that is not fully developed or has been repressed. You may be feeling inferior or insignificant.

Grammar - To dream that you are studying grammar suggests difficulties in getting your point across and communicating your ideas.

Underwater - suggests that you are being overcome with emotions and are in over your head regarding some situation. You need to gain greater control of your life.

Hugging - symbolizes your loving and caring nature. You are holding someone or something close to your heart. Alternatively, it may indicate your need to be more affectionate.

Merman - indicates a need to belong and to be part of something. Alternatively, a merman represents some message from your unconscious.

Rock - symbolizes strength, permanence, stability and integrity, as conveyed in the common phrase “as solid as a rock”. The dream may also indicate that you are making a commitment to a relationship or that you are contemplating some changes in your life that will lay the groundwork for a more solid foundation. Alternatively, a rock represents stubbornness, disharmony and unhappiness.

I dreamt that I went back to MPH and was in the cafeteria talking to old friends and hugging them. Suddenly the hall filled with water and a merman asked for help with a problem with the pool. Charlie, a thirteen-year-old girl, and I jumped into the cold water to bring a rock from the bottom of the deep pool. Then I had to pul the girl up because she was trying to get involved with something that was too much for her. She almost drowned and I yelled at her for getting into something she couldn’t handle. 
I left the camp without Charlie, moving down a lot of hallways and elevators, because I was scared about the mechanical problem that I KNOW has been in dreams before but I just can’t remember when. I got far enough away because I hadn’t used my cell phone so I was untraceable. But I knew I had to go back and get Charlie because I knew he would never be able to get back by himself. 
I went back and tried to use my cell phone to get ahold of him, but I had to go through a series of number punching and then a voice telling me I would never make it in time. I got into an elevator with other people and the voice was quiet which really pissed me off and made me scream at it. Doors started shutting on me and I was nearly escaping all these problems with technology and then I woke up.