To be fair, they were sleeping off a drunk from Founders Day. And bigger surprises have happened before in history. That said, you do have a point of them being in bed ten hours later....but I suspect even Clan warriors aren't immune to "It's a holiday, let's get smashed out of our minds" at least once a year...and this is Kirsten Redmond we're talking about here. If anyone is going to play the Walter Short/Husband Kimmel/Arthur Percival role in all of this? It's Kirsten Redmond.
I can just see it now:
Redmond in a message to all of her subordinate commanders: "Trothkin, I know chasing guerillas has been tough, that is why I am giving everyone not otherwise on duty a three-day weekend for Founder's Day as it is on a Sunday! I know we are all going to party hard as it has been rough lately. Also, I am ordering all 'Mechs not part of the duty roster put in the 'Mech bays so our Elementals can protect them from sabotage, but the shifts will be modified so everyone gets some time to celebrate our founder. Noone should worry, the Watch has assured me, the freebirths will not hit us on Founder's Day!"
Two days later in a Lyran POW enclosure from a surviving subordinate to Redmond: "The Freebirths will not hit us on Founder's Day, quiaff?"
Redmond's response: "Oh shut up, freebirth."