Jill woke up, as she had planned, exactly at seven.  Mike had a clock in his head, too, but his was quite erratic so far as Earth calendars and times were concerned; it vibrated to another need.  She slipped out of bed, put her head into the other room.  Lights were out and the shades were tight; it was quite dark.  But they were not asleep.  Jill heard Mike say with soft certainty: