When I went to bed last night, I set the alarm for 4 a.m. and was in bed by 9:30 p.m.   Then it started.  A beeping sound that came every two minutes, like clockwork.  It couldn’t be the fire alarm battery because we recently changed them all.  Beep.  Beep.  Beep.  Two hours later we still couldn’t distinguish the source.  I stuffed cotton in my ears, placed a pillow over my head, and finally fell asleep at 12:30 a.m.  The sound was gone by morning, and it shall forever remain a mystery.   And no, I didn’t get up at four with the alarm.  That would have taken a better woman than me!