Hmmm, alarm 'signals' to wake up the crew.
In years gone past, this was nothing more than a bicycle bell mounted to the captains or first officers foot rest, connected with a sturdy rubber band to the Bendix doppler leg change lever...the lever flips over, the bell rings, waking the pilots (and flight engineer), position report follows, wind in the next leg in the doppler...then back to sleep.
Worked like a charm...
Dozing for dollars...low tech style.