I think this is a great question for any level. (Elementary - Advanced).
An early bird gets up early and feels most energetic and productive in the morning, before 9 a.m.
A night owl usually works best in the evenings and feels energetic at night, especially after 11 p.m.
I have often been a night owl many times, but actually I feel like the morning is great, so long as I get enough sleep. If it is sunny in the morning it's great to get up early and see that beautiful blue sky and maybe go for a run.