F1 has tweaked the format for this weekend's first sprint event of the 2023 season in Baku, with a single free practice session on Friday followed by qualifying for Sunday's grand prix.
Saturday now features a shorter sprint qualifying 'shootout' for the afternoon's sprint race, meaning drivers will get thrown right into competitive action in the morning without a practice session to warm up.
According to Sainz, being thrown straight into the deep end on Saturday morning will be a huge challenge for the drivers.
"That will be difficult, especially waking up in the morning and going straight into Q1.
"I need to do a good warm-up, maybe a cold shower, make sure I'm really woken up for pushing flat-out in one of these cars on the straight first thing in the morning. I'll make sure I do my morning routine well because it will be intense."
Aston Martin driver Fernando Alonso thinks Saturdays will now be extra "stressful", although he felt F1 drivers and fans "have to embrace" the new format.
"I see the point of doing something that different on the weekend, so we have to embrace that, we have to help F1 and hopefully, the fans will give us good feedback on the weekend," he added.
"But it's more stressful, especially Saturday. We have breakfast, we go in the car, we tighten the belts, and we are in Q1.
"This is completely new, because even back in 2004 or 2006 we had to always practice before qualifying. Now we don't have any practice and we're going to Q1. So yeah, it's stressful for sure and more difficult for drivers."
Source: Autosport