Although it’s interesting to see the (slight) elevation between midnight and 2am [well before the onset of a typical “dawn effect” begins to kick in, with its signature gentle sloping rise until wake-up time], I would not call what’s seen in the graph as anything like a “spike.”
On the contrary, it seems your body has a nice self-regulated pattern underway with no material excursions. It looks like a well-controlled round of gluconeogenesis during sleep while your body is repairing/restoring physical and cerebral functions (which does require some level of glucose).
At this point are you concerned - or just curious?