Final Fantasy 15 – Downside of Multiple Days Without Sleeping

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While adventuring and completing side quests, I'd realized I'd gone days without stopping to rest and cashing in my experience (thanks to those nighttime hunts). My party has started complaining of being tired and looking forward to a good night's rest. Are their conversations just flavor or are there any negative effects to keeping my party up for multiple days without sleeping?

Best Answer

Apparently there is a penalty for going more than 3 days without sleep, according to the wikia page on Lodgings:

The party can go 3 days without sleep, after which they lose any status buffs.

According to an an interview with Final Fantasy XV's director:

The way it works is, if you don't sleep for long periods, you don't get a negative status – rather it's the opposite. "Buffs" are statuses with positive effects, and you stop getting those. Basically, things like increased spirits or feeling good or other added bonuses stop getting applied if you don't sleep for long periods of time.

However, you can maximize your EXP gains by refraining from sleeping. If you rack up a ton of EXP and spend 30k to sleep in the nice hotel that gives you 3x EXP boost (it's in Altissia, talk to the receptionist on the right), you will be able to level up a lot more than if you sleep every night, as you probably can't afford to shell out 30k every night.

Past chapter 9, you can return to sleep in this hotel by talking to Umbra.

From personal experience, I've run for 2 in-game days straight (gotta max out Survival!) and fought every dropship along the way, as well as captured an outpost. I didn't notice any penalties during these fights.