By smiling(smiling releases <span>endorphins</span>), and also do something they like!
I believe that it creates shocks to try and start the heart up again after a heart attack. (why the sticky pads are put with the heart in the middle)
Sorry if this may be late...
Answer: A good night’s sleep is usually 7-9 hours long, varying by age and maturation. Preparing for a good night’s sleep should include limiting caffeine, avoiding big meals, avoiding alcohol, and avoiding eye-strain before sleeping.
Habits that prevent a good night’s include [everything said not to do listed in the above paragraph].
