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].
Expected life events wont be as terrifying because you know they are coming unexpected life events could be deadly though cause i mean cancer is usually unexpected and it could go on for a while without you knowing. Hope this helps!