Yes. That is the sun. After a sleep that felt like 3 months, it's nice to wake up to such a wonderful feeling on your skin again. the plush body beneath you is much more comfortable than even the nice bed of straw and leaves that Pearl made for you. That, with the body heat of the small pokemon resting on you made for a comfortable night.
Sun. yes. the fiery orb in the sky. Full of fire and light. While the bed beneath beatrice was soft and heavenly, the weight of Period and Victini were a little too much to topple over in a way that ensured their safety. You are awake, but pinned.
You both had a restful night.