Potion of Tirelessness

After you drink this potion, you don't need to sleep, and magic can't put you to sleep. This effect lasts 24 hours. For the duration, you can finish a Long Rest in 4 hours if you spend those hours in a state of quiet focus, during which you retain consciousness.
This pale red potion is as thick as molasses, yet it slides out of the bottle as readily as oil.