"Optimus doesn't take time off because he's too self sacrificing"
Wrong!
Optimus can't take time off because he knows the second he isn't white knuckling the riens, Elita-One, Ironhide, Jazz, and Prowl are going scorched Earth on the Decepticons. It will end the war but it may also classify as a total annihilation.
Optimus, sleeping slightly deeper than he usually would: 😴
Prowl: Optimus is out of commission, I am now in charge. Elita, break out those plans we told him we didn't make, Ironhide, ready the acid bombs, Jazz, grab us a jet. We're ending this war tonight.
Elita "the ends can justify the means" One: You know, I don't think we've properly considered the elegance of germ warfare. We wouldn't even have to get our hands dirty.
Ironhide "I'm just showing him my cannons" the Weapons expert: That'll take too long. Nukes, that's the best way to go.
Jazz "I lead the most lethal fighters on this team" the Spy: We've got one shot, I can sneak in and stash some explosives in their barracks, they'll never catch me. Blow their whole base sky high.
Optimus, waking up in just the nick of time: I am begging you to stand down!
Ironhide: Told you we should have slipped a sedative in his high grade.
~~~~
Optimus, literally fighting to get out of the Medbay: You don't understand! They're plotting!
Ratchet: You have a broken leg and a head injury, sit your ass down!!
First Aid, who's been secretly trying to help the four of them end this thing: I'll grab a sedative. He may need a week of bedrest.
Meanwhile
Elita-one: Now, I did some research and did you know that half of our war crimes aren't considered war crimes on this planet?
Jazz: Fascinating. What a creative group.
Prowl: Indeed. And Optimus does want us abiding by the laws of this planet.
Ironhide, nodding along: He does.
Prowl: Whelp! Gotta follow orders obey the laws of this planet. It's not a war crime here, Jazz, get the rust bombs.