And the pilot likely was fatigued, having failed to take advantage of his adequate off-duty hours to get sleep, the NTSB said.

CNN: Pilot texting a factor in deadly copter crash

My few experiments with this were rather unsuccessful, with the alarm once going off before I managed to get to sleep and another time failing to wake me up at all.

ENGADGET: Jawbone Up review (2012): a reboot and a shot at redemption