Do nicotine patches really work for 24 hours?

On day 5 on the nicotine patches only and no smoking. While still tough it's working well this time and a big achievement for me after many many failed attempts. Plan it to follow the program and gradually reduce the patch strength over time.

Previously I found patches didn't work as I used to take them off before bed, but in the morning was when it failed as it takes the nicotine a long time to get to get in your system from patches and I would fall off the wagon in the morning.

This time I'm keeping them on over night. While the dreams are a bit crazy, I have found a massive difference in the morning with cravings.

My question is, most patches say they last for 24 hours, but do they really after 24 hours still supply the same amount of nicotine without wearing off?

I'm finding it hard to believe. Maybe they do, but I have been putting a fresh patch on around 6pm each day then putting another one on after I've had a shower in the morning just in case the cravings get too strong and I fail. Would prefer to just wear one patch for 24 hours if just as effective after 24 hours to save on costs.