For the first two or three nights she lay and shivered until she shivered herself to sleep.
Then she noticed how tightened up she was in every muscle when she woke, and she bethought herself that she would put her mind on relaxing her muscles and getting rid of the tension in her nerves.

She did this persistently, so that when she woke with the burglar fright it was at once a reminder to relax.
After a little she got the impression that she woke in order to relax and it was only a very little while before she succeeded so well that she did not wake until it was time to get up in the morning.
The burglar impression not only left her entirely, but left her with the habit of dropping all contractions before she went to sleep, and her nerves are stronger and more normal in consequence.
The two girls had each a very sensitive, nervous temperament, and the contrast in their behavior was simply a matter of intelligence.
This same nerve specialist received a patient once who was positively blatant in her complaint of a nervous shock.

"Doctor, I have had a horrible nervous shock.

It was horrible.

I do not see how I can ever get over it." Then she told it and brought the horrors out in weird, over-vivid colors.