Gas range burner won't ignite in the morning
Often the spark from the electric igniter is redirected and cannot ignite the burner gas. This could happen if there is any moisture on or near the electrode. Do you wipe down the stove in the evening, leaving it damp? Do you boil water on that burner in the evening, potentially causing dripping condensation that could be getting the area wet?

Another common cause is the gas port in the burner assembly. There is (usually) a small "pilot" port near the electrode that directs a small amount of gas to the electrode area, for easy (non-explosive) ignition. Ensure the port is free of corrosion and debris. This scenario does not seem to align with your "morning only" intermittent issue, however.