To dream of absorbing energy or water is likely to represent a time for true understanding of a situation in your life. It can mean that you have the ability to retain information and that now might be a good time to begin studying.
Depending on the emotions in the dream, to absorb something could also mean that you are taking on someone else's issues and business.
Being absorbed in your dream suggests you may need to enhance your ability to remain detached and keep clarity of mind. Alternatively you may be showing yourself that you are excellent at focusing when necessary.