Sony ICD-BP - Manual (Page 55)

Other Functions
55 GB
On Sleep display mode
If the unit is left unused for more than 3 seconds
in the stop mode, the display will turn to sleep
display mode as shown to the right, regardless of
the display mode setting.
To display the current time
Press xSTOP button during the sleep display mode. The current time will
be displayed for 3 seconds in the display window.