Ah amazing, thank u!!
Agree about being bored looking like sleepy. Mine does that too; starts yawning after 2-2.5 hours awake, and then we swap to do something else/change of scenery and she's fine for another 1/2 hour or an hour or more. But also sometimes when they're teething / got a cold etc, they might want more sleep too.
It could just be a phase, like a growth spurt (sometimes they want to sleep more). We had this a few months ago (LO is now one). We tried to bring nap times forward but he ended up doing shorter naps as he wasn’t tired enough. We found that sometimes when he is bored he shows sleepy signs, so we would change activity/distract him and keep him up, and he went back to longer naps.