Some people have internal clocks longer than 24 hours. It's called the Non-24-hour Sleep-Wake Syndrome!
It’s a chronic sleep disorder and most often affects those living in a time-isolated facility with no time cues. It consists of a chronic steady pattern of one to two hour daily delays in sleep onset and wake times in an individual living in society.
The pattern of delay continues literally around the clock. It takes a week or two to complete a cycle. It causes nighttime sleepiness and excessive daytime fatigue and napping.
