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It was late at night, and Astrid still hadn't slept because he kept on thinking about how the conversation between Wulfric and the Grimaldis had gone. That's why when he received a message from Wulfric, telling him that he would call him tomorrow to tell him what happened.
The other probably thought that he was already sleeping. So, in consideration of him, he just sent a message instead. But since Astrid was still awake, he just sat up from bed and call the other. It's not like he could immediately go to sleep, anyway. Especially since he was certain he would just be thinking about how that conversation went.