G-Shock MRG-8100B-1A - Manual (Page 12)

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Though the hands are stopped, the watch continues to keep time

internally.
Note that the watch also may enter the sleep state if its face is

blocked from light by your sleeve.
The watch does not enter the sleep state if it is in the Stopwatch

Mode or Countdown Timer Mode.
How the sleep state works
Sleep Level 1
Sleep Level 1 is triggered whenever the watch is left in the dark for
about one hour any time between the hours of 10 p.m. and 6 a.m. At
this time, watch functions will operate as described below.
The second hand will stop at its current position.

The hour hand, 24-hour time hands, minute hand, and date

indicator will continue to operate normally.
Auto Receive is performed normally.

Alarms and the hourly time signal will continue to operate normally.

At this time, watch functions will operate as described below.
Sleep Level 2
Sleep Level 2 is triggered whenever the watch is left in the dark while
in Sleep Level 1 for six or seven days.
The hour hand, 24-hour time hand, minute hand, and World Time

will stop at their current positions.
World Time timekeeping will stop at the point the current time in

the Timekeeping Mode reached 0:00.
Auto Receive will be disabled.

Alarms and the hourly time signal will be disabled.

Date display will continue to operate normally.
