The current version of a fire clock*, Candle timer. It is just like the fire of a candle is going out.. during your sleep...
*Do you know the fire clock A water clock, sundial, sandglass, and fire clock... The human have read time by observing the flow of the nature. A fire clock is the clock used in the ancients. The ancient people could know time with the scales on the candle, which are gradually going off as the candle is melted by fire.
The current version of a fire clock
which is borrow the wisdom of the ancestors
