When you are learning to be more present, each moment has a feeling of wrongness to it. When you relish in the little things, like sunlight reflected from a watch dancing on the wall, it feels like a certain gravity is amiss, like you might just float away into nothing.
What is missing is worry. Worry is the weight which makes life heavy. Without it, we feel almost insubstantial. Insubstantial, but wonderful. It just takes awhile to get used to.