Hours 'Til Morning is the final stage in Sports Night.
Lord Gravey and Zir Zeal serve as the main threats of this level.
Strategy 1 (ft. Polevaulter Cat)
Line up: 3 meatshields (for example Eraser Cat, Crazed Wall Cat and Jiangshi Cat), Housewife Cat, another anti-Zombie Cat (Weedwacker Cat preferred), anti-Red Cats (Crazed Whale Cat, Island Cat, etc.), ranged attackers (Crazed Sexy Legs Cat, etc.) and fast units (Crazed Giraffe Cat, etc.). Awakened Bahamut Cat and Ururun Cat are optional.
This level is relatively tame compared to the previous stage, Fallen Priest. The only problems are Lord Gravey blocking your heavy hitters from destroying the base and Zir Zeal and Dead Donny Dash disrupting your backline and ranged attackers.
Start with some anti-Reds and meatshields to stall the Pigge Backs and save some money. After the Pigge Backs are dealt with, start sending in anti-Zombie Cats (e.g. Polevaulter Cat), meatshields and ranged attackers towards the base. When the boss spawns, send in A. Bahamut and fast units when both the Zir Zeal and Dead Donny Dash are burrowing to clear the Pigges and get a few hits on Lord Gravey.
Now, you want to make sure to stack as many Polevaulter Cats and anti-Zombie Cats as possible so it'll become likely for them to last hit the Zombie enemies, hence trigger the Zombie Killer ability. This is where Polevaulter Cat shines: She has shorter standing range than Dead Donny Dash and longer standing range than Lord Gravey. Since Dead Donny Dash doesn't dig very far from the enemy base if you have a fast unit when the boss shockwave hits, ideally Polevaulter Cat can get into his blind spot as well as be able to support A. Bahamut by slowing Lord Gravey using her Long Distance ability without being knocked back.
The only thing you need to watch out for is the Zir Zeal, as he can stop literally every unit in your lineup and allow Dead Donny Dash to snipe your units, so kill them Zir Zeals as fast as possible (preferably with a Zombie Killer).
After the Zir Zeals and Lord Gravey are dead, you are free to attack the base as the other enemies in this stage can't do anything to stop you.