Congrats! That is great
I got the sleepy feeling too. Some days I was so tired I was not sure I would make it through the day.
When I get that way now I think of HALT. Hungry, Angry, Lonely, Tired. They can be triggers and I stop or HALT and think of why I am feeling this way.
Tired is just that, you are tired. It is your system telling you that you need more rest or sleep. For me these feelings can drop my defenses or my resolve.